$$2s+4 = 5\cdot(-4-2s)$$

$$ \begin{aligned} 2s+4 &= 5\cdot(-4-2s)&& \text{simplify right side} \\[1 em]2s+4 &= -20-10s&& \\[1 em]2s+4 &= -10s-20&& \text{move the $ \color{blue}{ -10s } $ to the left side and $ \color{blue}{ 4 }$ to the right} \\[1 em]2s+10s &= -20-4&& \text{simplify left and right hand side} \\[1 em]12s &= -24&& \text{ divide both sides by $ 12 $ } \\[1 em]s &= -\frac{24}{12}&& \\[1 em]s &= -2&& \\[1 em] \end{aligned} $$

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