Question
$$8-4s = s+13$$
Answer
$$ s = -1 $$
Explanation
$$ \begin{aligned} 8-4s &= s+13&& \text{move the $ \color{blue}{ s } $ to the left side and $ \color{blue}{ 8 }$ to the right} \\[1 em]-4s-s &= 13-8&& \text{simplify left and right hand side} \\[1 em]-5s &= 5&& \text{ divide both sides by $ -5 $ } \\[1 em]s &= -\frac{5}{5}&& \\[1 em]s &= -1&& \\[1 em] \end{aligned} $$
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