#### Answer

$-2\leq f$

#### Work Step by Step

$-(7f+18)-2f\leq0\longrightarrow$ multiply by -1 using the distributive property
$-7f-18-2f\leq0\longrightarrow$ combine like terms
$-9f-18\leq0\longrightarrow$ add 9f to each side
$-9f-18+9f\leq0+9f\longrightarrow$ add
$-18\leq9f\longrightarrow$ divide each side by 9
$-18\div9\leq9f\div9\longrightarrow$ divide
$-2\leq f$