Question
$$20 = 7h-12h$$
Answer
$$ h = -4 $$
Explanation
$$ \begin{aligned} 20 &= 7h-12h&& \text{simplify right side} \\[1 em]20 &= -5h&& \text{ swap the left and right side of the equation } \\[1 em]-5h &= 20&& \text{ divide both sides by $ -5 $ } \\[1 em]h &= -\frac{20}{5}&& \\[1 em]h &= -4&& \\[1 em] \end{aligned} $$
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