$$ \begin{aligned} -(4+h) &= 3h&& \text{simplify left side} \\[1 em]-4-h &= 3h&& \\[1 em]-h-4 &= 3h&& \text{move the $ \color{blue}{ 3h } $ to the left side and $ \color{blue}{ -4 }$ to the right} \\[1 em]-h-3h &= 4&& \text{simplify left side} \\[1 em]-4h &= 4&& \text{ divide both sides by $ -4 $ } \\[1 em]h &= -\frac{4}{4}&& \\[1 em]h &= -1&& \\[1 em] \end{aligned} $$

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