Solve for f -12f+18=-8f+9+9

$- 12 f + 18 = - 8 f + 9 + 9$

Add $9$ and $9$ .

$- 12 f + 18 = - 8 f + 18$

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

Add $8 f$ to both sides of the equation.

$- 12 f + 18 + 8 f = 18$

Add $- 12 f$ and $8 f$ .

$- 4 f + 18 = 18$

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

Subtract $18$ from both sides of the equation.

$- 4 f = 18 - 18$

Subtract $18$ from $18$ .

$- 4 f = 0$

Divide each term in $- 4 f = 0$ by $- 4$ and simplify.

Divide each term in $- 4 f = 0$ by $- 4$ .

$\frac{- 4 f}{- 4} = \frac{0}{- 4}$

Simplify the left side.

Cancel the common factor of $- 4$ .

Cancel the common factor.

$\frac{- 4 f}{- 4} = \frac{0}{- 4}$

Divide $f$ by $1$ .

$f = \frac{0}{- 4}$

Simplify the right side.

Divide $0$ by $- 4$ .

$f = 0$