$$ \begin{aligned} 2(s+5) &= 10s+5&& \text{simplify left side} \\[1 em]2s+10 &= 10s+5&& \text{move the $ \color{blue}{ 10s } $ to the left side and $ \color{blue}{ 10 }$ to the right} \\[1 em]2s-10s &= 5-10&& \text{simplify left and right hand side} \\[1 em]-8s &= -5&& \text{ divide both sides by $ -8 $ } \\[1 em]s &= \frac{-5}{-8}&& \\[1 em]s &= \frac{5}{8}&& \\[1 em] \end{aligned} $$

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