Question
$$h+20 = 35-4h$$
Answer
$$ h = 3 $$
Explanation
$$ \begin{aligned} h+20 &= 35-4h&& \text{move the $ \color{blue}{ -4h } $ to the left side and $ \color{blue}{ 20 }$ to the right} \\[1 em]h+4h &= 35-20&& \text{simplify left and right hand side} \\[1 em]5h &= 15&& \text{ divide both sides by $ 5 $ } \\[1 em]h &= \frac{15}{5}&& \\[1 em]h &= 3&& \\[1 em] \end{aligned} $$
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