$$ \begin{aligned} 6m+6 &= 2m+30&& \text{move the $ \color{blue}{ 2m } $ to the left side and $ \color{blue}{ 6 }$ to the right} \\[1 em]6m-2m &= 30-6&& \text{simplify left and right hand side} \\[1 em]4m &= 24&& \text{ divide both sides by $ 4 $ } \\[1 em]m &= \frac{24}{4}&& \\[1 em]m &= 6&& \\[1 em] \end{aligned} $$
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