$$ \begin{aligned} 17m+6 &= 15m-2&& \text{move the $ \color{blue}{ 15m } $ to the left side and $ \color{blue}{ 6 }$ to the right} \\[1 em]17m-15m &= -2-6&& \text{simplify left and right hand side} \\[1 em]2m &= -8&& \text{ divide both sides by $ 2 $ } \\[1 em]m &= -\frac{8}{2}&& \\[1 em]m &= -4&& \\[1 em] \end{aligned} $$
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