$$ \begin{aligned} 3(w-5) &= 2w+10&& \text{simplify left side} \\[1 em]3w-15 &= 2w+10&& \text{move the $ \color{blue}{ 2w } $ to the left side and $ \color{blue}{ -15 }$ to the right} \\[1 em]3w-2w &= 10+15&& \text{simplify left and right hand side} \\[1 em]w &= 25&& \\[1 em]w &= 25&& \\[1 em] \end{aligned} $$
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