$$2h\cdot3 = -6h-13h\cdot2$$

$$ \begin{aligned} 2h\cdot3 &= -6h-13h\cdot2&& \text{simplify left and right hand side} \\[1 em]6h &= -6h-26h&& \\[1 em]6h &= -32h&& \text{move the $ \color{blue}{ -32h } $ to the left side} \\[1 em]6h+32h &= 0&& \text{simplify left side} \\[1 em]38h &= 0&& \text{ divide both sides by $ 38 $ } \\[1 em]h &= \frac{0}{38}&& \\[1 em]h &= 0&& \\[1 em] \end{aligned} $$

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