$$ \begin{aligned} 5h+6 &= 2h+15&& \text{move the $ \color{blue}{ 2h } $ to the left side and $ \color{blue}{ 6 }$ to the right} \\[1 em]5h-2h &= 15-6&& \text{simplify left and right hand side} \\[1 em]3h &= 9&& \text{ divide both sides by $ 3 $ } \\[1 em]h &= \frac{9}{3}&& \\[1 em]h &= 3&& \\[1 em] \end{aligned} $$
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