Question
$$-4 = 5s-7s$$
Answer
$$ s = 2 $$
Explanation
$$ \begin{aligned} -4 &= 5s-7s&& \text{simplify right side} \\[1 em]-4 &= -2s&& \text{ swap the left and right side of the equation } \\[1 em]-2s &= -4&& \text{ divide both sides by $ -2 $ } \\[1 em]s &= \frac{-4}{-2}&& \\[1 em]s &= 2&& \\[1 em] \end{aligned} $$
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