## Algebra 1: Common Core (15th Edition)

$\boxed {f \geq -2}$
Whenever anything is in the form of $-(x)$ , it is the same thing as $-1 \times (x)$. $$-1(7f+18) - 2f \leq 0$$ Now, multiply $-1$ by $(7f + 18)$ $$-7f - 18 - 2f \leq 0$$ $$-9f - 18 \leq 0$$ Multiply both sides by $-1$. The $\leq$ will change into $\geq$ $$9f + 18 \geq 0$$ Now subtract 18 from both sides $$9f \geq -18$$ Divide both sides by 9 $$\boxed {f \geq -2}$$