$$ \begin{aligned} 3m+5 &= m-1&& \text{move the $ \color{blue}{ m } $ to the left side and $ \color{blue}{ 5 }$ to the right} \\[1 em]3m-m &= -1-5&& \text{simplify left and right hand side} \\[1 em]2m &= -6&& \text{ divide both sides by $ 2 $ } \\[1 em]m &= -\frac{6}{2}&& \\[1 em]m &= -3&& \\[1 em] \end{aligned} $$
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