$$12s+8 = 10s+8$$
Answer
$$ s = 0 $$
Explanation
$$ \begin{aligned} 12s+8 &= 10s+8&& \text{move the $ \color{blue}{ 10s } $ to the left side and $ \color{blue}{ 8 }$ to the right} \\[1 em]12s-10s &= 8-8&& \text{simplify left and right hand side} \\[1 em]2s &= 0&& \text{ divide both sides by $ 2 $ } \\[1 em]s &= \frac{0}{2}&& \\[1 em]s &= 0&& \\[1 em] \end{aligned} $$
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