Precalculus Examples

$9 w + 10 x + 13 y + 13 z = 5$ , $9 w + 9 x + 11 y + 12 z = 7$ , $9 w + 7 x + 7 y + 10 z = 11$

Step 1

Solve the equation for $w$ .

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Move all terms not containing $w$ to the right side of the equation.

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Subtract $10 x$ from both sides of the equation.

$9 w + 13 y + 13 z = 5 - 10 x$

$9 w + 9 x + 11 y + 12 z = 7$

$9 w + 7 x + 7 y + 10 z = 11$

Subtract $13 y$ from both sides of the equation.

$9 w + 13 z = 5 - 10 x - 13 y$

$9 w + 9 x + 11 y + 12 z = 7$

$9 w + 7 x + 7 y + 10 z = 11$

Subtract $13 z$ from both sides of the equation.

$9 w = 5 - 10 x - 13 y - 13 z$

$9 w + 9 x + 11 y + 12 z = 7$

$9 w + 7 x + 7 y + 10 z = 11$

$9 w = 5 - 10 x - 13 y - 13 z$

$9 w + 9 x + 11 y + 12 z = 7$

$9 w + 7 x + 7 y + 10 z = 11$

Divide each term in $9 w = 5 - 10 x - 13 y - 13 z$ by $9$ and simplify.

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Divide each term in $9 w = 5 - 10 x - 13 y - 13 z$ by $9$ .

$\frac{9 w}{9} = \frac{5}{9} + \frac{- 10 x}{9} + \frac{- 13 y}{9} + \frac{- 13 z}{9}$

$9 w + 9 x + 11 y + 12 z = 7$

$9 w + 7 x + 7 y + 10 z = 11$

Simplify the left side.

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Cancel the common factor of $9$ .

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Cancel the common factor.

$\frac{9 w}{9} = \frac{5}{9} + \frac{- 10 x}{9} + \frac{- 13 y}{9} + \frac{- 13 z}{9}$

$9 w + 9 x + 11 y + 12 z = 7$

$9 w + 7 x + 7 y + 10 z = 11$

Divide $w$ by $1$ .

$w = \frac{5}{9} + \frac{- 10 x}{9} + \frac{- 13 y}{9} + \frac{- 13 z}{9}$

$9 w + 9 x + 11 y + 12 z = 7$

$9 w + 7 x + 7 y + 10 z = 11$

$w = \frac{5}{9} + \frac{- 10 x}{9} + \frac{- 13 y}{9} + \frac{- 13 z}{9}$

$9 w + 9 x + 11 y + 12 z = 7$

$9 w + 7 x + 7 y + 10 z = 11$

$w = \frac{5}{9} + \frac{- 10 x}{9} + \frac{- 13 y}{9} + \frac{- 13 z}{9}$

$9 w + 9 x + 11 y + 12 z = 7$

$9 w + 7 x + 7 y + 10 z = 11$

Simplify the right side.

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Simplify each term.

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Move the negative in front of the fraction.

$w = \frac{5}{9} - \frac{(10) x}{9} + \frac{- 13 y}{9} + \frac{- 13 z}{9}$

$9 w + 9 x + 11 y + 12 z = 7$

$9 w + 7 x + 7 y + 10 z = 11$

Move the negative in front of the fraction.

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{(13) y}{9} + \frac{- 13 z}{9}$

$9 w + 9 x + 11 y + 12 z = 7$

$9 w + 7 x + 7 y + 10 z = 11$

Move the negative in front of the fraction.

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 9 x + 11 y + 12 z = 7$

$9 w + 7 x + 7 y + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 9 x + 11 y + 12 z = 7$

$9 w + 7 x + 7 y + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 9 x + 11 y + 12 z = 7$

$9 w + 7 x + 7 y + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 9 x + 11 y + 12 z = 7$

$9 w + 7 x + 7 y + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 9 x + 11 y + 12 z = 7$

$9 w + 7 x + 7 y + 10 z = 11$

Step 2

Solve the equation for $x$ .

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Simplify $9 (\frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}) + 9 x + 11 y + 12 z$ .

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Simplify each term.

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Apply the distributive property.

$9 (\frac{5}{9}) + 9 (- \frac{10 x}{9}) + 9 (- \frac{13 y}{9}) + 9 (- \frac{13 z}{9}) + 9 x + 11 y + 12 z = 7$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Simplify.

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Cancel the common factor of $9$ .

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Cancel the common factor.

$9 (\frac{5}{9}) + 9 (- \frac{10 x}{9}) + 9 (- \frac{13 y}{9}) + 9 (- \frac{13 z}{9}) + 9 x + 11 y + 12 z = 7$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Rewrite the expression.

$5 + 9 (- \frac{10 x}{9}) + 9 (- \frac{13 y}{9}) + 9 (- \frac{13 z}{9}) + 9 x + 11 y + 12 z = 7$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

$5 + 9 (- \frac{10 x}{9}) + 9 (- \frac{13 y}{9}) + 9 (- \frac{13 z}{9}) + 9 x + 11 y + 12 z = 7$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Cancel the common factor of $9$ .

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Move the leading negative in $- \frac{10 x}{9}$ into the numerator.

$5 + 9 (\frac{- 10 x}{9}) + 9 (- \frac{13 y}{9}) + 9 (- \frac{13 z}{9}) + 9 x + 11 y + 12 z = 7$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Cancel the common factor.

$5 + 9 (\frac{- 10 x}{9}) + 9 (- \frac{13 y}{9}) + 9 (- \frac{13 z}{9}) + 9 x + 11 y + 12 z = 7$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Rewrite the expression.

$5 - 10 x + 9 (- \frac{13 y}{9}) + 9 (- \frac{13 z}{9}) + 9 x + 11 y + 12 z = 7$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

$5 - 10 x + 9 (- \frac{13 y}{9}) + 9 (- \frac{13 z}{9}) + 9 x + 11 y + 12 z = 7$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Cancel the common factor of $9$ .

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Move the leading negative in $- \frac{13 y}{9}$ into the numerator.

$5 - 10 x + 9 (\frac{- 13 y}{9}) + 9 (- \frac{13 z}{9}) + 9 x + 11 y + 12 z = 7$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Cancel the common factor.

$5 - 10 x + 9 (\frac{- 13 y}{9}) + 9 (- \frac{13 z}{9}) + 9 x + 11 y + 12 z = 7$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Rewrite the expression.

$5 - 10 x - 13 y + 9 (- \frac{13 z}{9}) + 9 x + 11 y + 12 z = 7$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

$5 - 10 x - 13 y + 9 (- \frac{13 z}{9}) + 9 x + 11 y + 12 z = 7$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Cancel the common factor of $9$ .

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Move the leading negative in $- \frac{13 z}{9}$ into the numerator.

$5 - 10 x - 13 y + 9 (\frac{- 13 z}{9}) + 9 x + 11 y + 12 z = 7$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Cancel the common factor.

$5 - 10 x - 13 y + 9 (\frac{- 13 z}{9}) + 9 x + 11 y + 12 z = 7$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Rewrite the expression.

$5 - 10 x - 13 y - 13 z + 9 x + 11 y + 12 z = 7$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

$5 - 10 x - 13 y - 13 z + 9 x + 11 y + 12 z = 7$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

$5 - 10 x - 13 y - 13 z + 9 x + 11 y + 12 z = 7$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

$5 - 10 x - 13 y - 13 z + 9 x + 11 y + 12 z = 7$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Simplify by adding terms.

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Add $- 10 x$ and $9 x$ .

$5 - x - 13 y - 13 z + 11 y + 12 z = 7$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Add $- 13 y$ and $11 y$ .

$5 - x - 2 y - 13 z + 12 z = 7$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Add $- 13 z$ and $12 z$ .

$5 - x - 2 y - z = 7$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

$5 - x - 2 y - z = 7$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

$5 - x - 2 y - z = 7$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Move all terms not containing $x$ to the right side of the equation.

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Subtract $5$ from both sides of the equation.

$- x - 2 y - z = 7 - 5$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Add $2 y$ to both sides of the equation.

$- x - z = 7 - 5 + 2 y$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Add $z$ to both sides of the equation.

$- x = 7 - 5 + 2 y + z$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Subtract $5$ from $7$ .

$- x = 2 + 2 y + z$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

$- x = 2 + 2 y + z$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Divide each term in $- x = 2 + 2 y + z$ by $- 1$ and simplify.

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Divide each term in $- x = 2 + 2 y + z$ by $- 1$ .

$\frac{- x}{- 1} = \frac{2}{- 1} + \frac{2 y}{- 1} + \frac{z}{- 1}$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Simplify the left side.

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Dividing two negative values results in a positive value.

$\frac{x}{1} = \frac{2}{- 1} + \frac{2 y}{- 1} + \frac{z}{- 1}$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Divide $x$ by $1$ .

$x = \frac{2}{- 1} + \frac{2 y}{- 1} + \frac{z}{- 1}$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

$x = \frac{2}{- 1} + \frac{2 y}{- 1} + \frac{z}{- 1}$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Simplify the right side.

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Simplify each term.

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Divide $2$ by $- 1$ .

$x = - 2 + \frac{2 y}{- 1} + \frac{z}{- 1}$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Move the negative one from the denominator of $\frac{2 y}{- 1}$ .

$x = - 2 - 1 \cdot (2 y) + \frac{z}{- 1}$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Rewrite $- 1 \cdot (2 y)$ as $- (2 y)$ .

$x = - 2 - (2 y) + \frac{z}{- 1}$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Multiply $2$ by $- 1$ .

$x = - 2 - 2 y + \frac{z}{- 1}$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Move the negative one from the denominator of $\frac{z}{- 1}$ .

$x = - 2 - 2 y - 1 \cdot z$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Rewrite $- 1 \cdot z$ as $- z$ .

$x = - 2 - 2 y - z$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

$x = - 2 - 2 y - z$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

$x = - 2 - 2 y - z$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

$x = - 2 - 2 y - z$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

$x = - 2 - 2 y - z$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$9 w + 7 x + 7 y + 10 z = 11$

Step 3

Solve the equation for $y$ .

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Simplify $9 (\frac{5}{9} - \frac{10 (- 2 - 2 y - z)}{9} - \frac{13 y}{9} - \frac{13 z}{9}) + 7 (- 2 - 2 y - z) + 7 y + 10 z$ .

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Simplify each term.

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Combine the numerators over the common denominator.

$9 (\frac{5 - 10 (- 2 - 2 y - z) - 13 y - 13 z}{9}) + 7 (- 2 - 2 y - z) + 7 y + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

Simplify each term.

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Apply the distributive property.

$9 (\frac{5 - 10 \cdot - 2 - 10 (- 2 y) - 10 (- z) - 13 y - 13 z}{9}) + 7 (- 2 - 2 y - z) + 7 y + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

Simplify.

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Multiply $- 10$ by $- 2$ .

$9 (\frac{5 + 20 - 10 (- 2 y) - 10 (- z) - 13 y - 13 z}{9}) + 7 (- 2 - 2 y - z) + 7 y + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

Multiply $- 2$ by $- 10$ .

$9 (\frac{5 + 20 + 20 y - 10 (- z) - 13 y - 13 z}{9}) + 7 (- 2 - 2 y - z) + 7 y + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

Multiply $- 1$ by $- 10$ .

$9 (\frac{5 + 20 + 20 y + 10 z - 13 y - 13 z}{9}) + 7 (- 2 - 2 y - z) + 7 y + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

$9 (\frac{5 + 20 + 20 y + 10 z - 13 y - 13 z}{9}) + 7 (- 2 - 2 y - z) + 7 y + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

$9 (\frac{5 + 20 + 20 y + 10 z - 13 y - 13 z}{9}) + 7 (- 2 - 2 y - z) + 7 y + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

Add $5$ and $20$ .

$9 (\frac{25 + 20 y + 10 z - 13 y - 13 z}{9}) + 7 (- 2 - 2 y - z) + 7 y + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

Subtract $13 y$ from $20 y$ .

$9 (\frac{25 + 7 y + 10 z - 13 z}{9}) + 7 (- 2 - 2 y - z) + 7 y + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

Subtract $13 z$ from $10 z$ .

$9 (\frac{25 + 7 y - 3 z}{9}) + 7 (- 2 - 2 y - z) + 7 y + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

Cancel the common factor of $9$ .

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Cancel the common factor.

$9 (\frac{25 + 7 y - 3 z}{9}) + 7 (- 2 - 2 y - z) + 7 y + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

Rewrite the expression.

$25 + 7 y - 3 z + 7 (- 2 - 2 y - z) + 7 y + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

$25 + 7 y - 3 z + 7 (- 2 - 2 y - z) + 7 y + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

Apply the distributive property.

$25 + 7 y - 3 z + 7 \cdot - 2 + 7 (- 2 y) + 7 (- z) + 7 y + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

Simplify.

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Multiply $7$ by $- 2$ .

$25 + 7 y - 3 z - 14 + 7 (- 2 y) + 7 (- z) + 7 y + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

Multiply $- 2$ by $7$ .

$25 + 7 y - 3 z - 14 - 14 y + 7 (- z) + 7 y + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

Multiply $- 1$ by $7$ .

$25 + 7 y - 3 z - 14 - 14 y - 7 z + 7 y + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

$25 + 7 y - 3 z - 14 - 14 y - 7 z + 7 y + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

$25 + 7 y - 3 z - 14 - 14 y - 7 z + 7 y + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

Simplify by adding terms.

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Subtract $14$ from $25$ .

$7 y - 3 z + 11 - 14 y - 7 z + 7 y + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

Subtract $14 y$ from $7 y$ .

$- 7 y - 3 z + 11 - 7 z + 7 y + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

Combine the opposite terms in $- 7 y - 3 z + 11 - 7 z + 7 y + 10 z$ .

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Add $- 7 y$ and $7 y$ .

$- 3 z + 11 - 7 z + 0 + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

Add $- 3 z + 11 - 7 z$ and $0$ .

$- 3 z + 11 - 7 z + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

$- 3 z + 11 - 7 z + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

Subtract $7 z$ from $- 3 z$ .

$- 10 z + 11 + 10 z = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

Combine the opposite terms in $- 10 z + 11 + 10 z$ .

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Add $- 10 z$ and $10 z$ .

$0 + 11 = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

Add $0$ and $11$ .

$11 = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

$11 = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

$11 = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

$11 = 11$

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

Since $11 = 11$ , the equation will always be true.

Always true

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

Always true

$w = \frac{5}{9} - \frac{10 x}{9} - \frac{13 y}{9} - \frac{13 z}{9}$

$x = - 2 - 2 y - z$

Step 4

Simplify the right side.

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Simplify $\frac{5}{9} - \frac{10 (- 2 - 2 y - z)}{9} - \frac{13 y}{9} - \frac{13 z}{9}$ .

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Combine the numerators over the common denominator.

$w = \frac{5 - 10 (- 2 - 2 y - z) - 13 y - 13 z}{9}$

$x = - 2 - 2 y - z$

Always true

Simplify each term.

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Apply the distributive property.

$w = \frac{5 - 10 \cdot - 2 - 10 (- 2 y) - 10 (- z) - 13 y - 13 z}{9}$

$x = - 2 - 2 y - z$

Always true

Simplify.

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Multiply $- 10$ by $- 2$ .

$w = \frac{5 + 20 - 10 (- 2 y) - 10 (- z) - 13 y - 13 z}{9}$

$x = - 2 - 2 y - z$

Always true

Multiply $- 2$ by $- 10$ .

$w = \frac{5 + 20 + 20 y - 10 (- z) - 13 y - 13 z}{9}$

$x = - 2 - 2 y - z$

Always true

Multiply $- 1$ by $- 10$ .

$w = \frac{5 + 20 + 20 y + 10 z - 13 y - 13 z}{9}$

$x = - 2 - 2 y - z$

Always true

$w = \frac{5 + 20 + 20 y + 10 z - 13 y - 13 z}{9}$

$x = - 2 - 2 y - z$

Always true

$w = \frac{5 + 20 + 20 y + 10 z - 13 y - 13 z}{9}$

$x = - 2 - 2 y - z$

Always true

Simplify by adding terms.

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Add $5$ and $20$ .

$w = \frac{25 + 20 y + 10 z - 13 y - 13 z}{9}$

$x = - 2 - 2 y - z$

Always true

Subtract $13 y$ from $20 y$ .

$w = \frac{25 + 7 y + 10 z - 13 z}{9}$

$x = - 2 - 2 y - z$

Always true

Subtract $13 z$ from $10 z$ .

$w = \frac{25 + 7 y - 3 z}{9}$

$x = - 2 - 2 y - z$

Always true

$w = \frac{25 + 7 y - 3 z}{9}$

$x = - 2 - 2 y - z$

Always true

$w = \frac{25 + 7 y - 3 z}{9}$

$x = - 2 - 2 y - z$

Always true

$w = \frac{25 + 7 y - 3 z}{9}$

$x = - 2 - 2 y - z$

Always true

Step 5

Simplify the right side.

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Move $- 2$ .

$x = - 2 y - z - 2$

$w = \frac{25 + 7 y - 3 z}{9}$

Always true

$x = - 2 y - z - 2$

$w = \frac{25 + 7 y - 3 z}{9}$

Always true