Algebra Examples

$f (x) = x + 4$ , $f (x) = 3 x$

Step 1

Substitute $3 x$ for $f (x)$ .

$3 x = x + 4$

Step 2

Solve for $x$ .

Tap for more steps...

Move all terms containing $x$ to the left side of the equation.

Tap for more steps...

Subtract $x$ from both sides of the equation.

$3 x - x = 4$

Subtract $x$ from $3 x$ .

$2 x = 4$

Divide each term in $2 x = 4$ by $2$ and simplify.

Tap for more steps...

Divide each term in $2 x = 4$ by $2$ .

$\frac{2 x}{2} = \frac{4}{2}$

Simplify the left side.

Tap for more steps...

Cancel the common factor of $2$ .

Tap for more steps...

Cancel the common factor.

$\frac{2 x}{2} = \frac{4}{2}$

Divide $x$ by $1$ .

$x = \frac{4}{2}$

Simplify the right side.

Tap for more steps...

Divide $4$ by $2$ .

$x = 2$

Enter YOUR Problem