$$ \begin{aligned} 28+6h &= -9(4h-3)&& \text{simplify left and right hand side} \\[1 em]6h+28 &= -(36h-27)&& \\[1 em]6h+28 &= -36h+27&& \text{move the $ \color{blue}{ -36h } $ to the left side and $ \color{blue}{ 28 }$ to the right} \\[1 em]6h+36h &= 27-28&& \text{simplify left and right hand side} \\[1 em]42h &= -1&& \text{ divide both sides by $ 42 $ } \\[1 em]h &= -\frac{1}{42}&& \\[1 em] \end{aligned} $$

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