$$ \begin{aligned} 5m-4 &= m+4+m+4&& \text{simplify right side} \\[1 em]5m-4 &= 2m+8&& \text{move the $ \color{blue}{ 2m } $ to the left side and $ \color{blue}{ -4 }$ to the right} \\[1 em]5m-2m &= 8+4&& \text{simplify left and right hand side} \\[1 em]3m &= 12&& \text{ divide both sides by $ 3 $ } \\[1 em]m &= \frac{12}{3}&& \\[1 em]m &= 4&& \\[1 em] \end{aligned} $$

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