Algebra Examples

$x + 9 = 18 + - 2$

Step 1

Replace all occurrences of $+$ $-$ with a single $-$ . A plus sign followed by a minus sign has the same mathematical meaning as a single minus sign because $1 \cdot - 1 = - 1$

$x + 9 = 18 - 2$

Step 2

Subtract $2$ from $18$ .

$x + 9 = 16$

Step 3

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

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Step 3.1

Subtract $9$ from both sides of the equation.

$x = 16 - 9$

Step 3.2

Subtract $9$ from $16$ .

$x = 7$