$$ \begin{aligned} 4h-2 &= 2(h+3)&& \text{simplify right side} \\[1 em]4h-2 &= 2h+6&& \text{move the $ \color{blue}{ 2h } $ to the left side and $ \color{blue}{ -2 }$ to the right} \\[1 em]4h-2h &= 6+2&& \text{simplify left and right hand side} \\[1 em]2h &= 8&& \text{ divide both sides by $ 2 $ } \\[1 em]h &= \frac{8}{2}&& \\[1 em]h &= 4&& \\[1 em] \end{aligned} $$

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