Answer
$\boxed {f \geq -2}$
Work Step by Step
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
$$\boxed {f \geq -2}$$
