# How do you solve -4 + f < 20?

Jun 16, 2018

$f < 24$

#### Explanation:

You can add the same amount to both sides of an inequality without effecting the validity or direction of the inequality.

So
$\textcolor{w h i t e}{\text{XXX}} - 4 + f < 20$

$\textcolor{w h i t e}{\text{XXX}} \Rightarrow - 4 + f \textcolor{b l u e}{+ 4} < 20 \textcolor{b l u e}{+ 4}$

$\textcolor{w h i t e}{\text{XXX}} \Rightarrow f < 24$