Question
$$-4\cdot(8-7s) = 25$$
Answer
$$ s = \dfrac{57}{28} $$
Explanation
$$ \begin{aligned} -4\cdot(8-7s) &= 25&& \text{simplify left side} \\[1 em]-(32-28s) &= 25&& \\[1 em]-32+28s &= 25&& \\[1 em]28s-32 &= 25&& \text{ move -32 to the right } \\[1 em]28s &= 25+32&& \\[1 em]28s &= 57&& \text{ divide both sides by $ 28 $ } \\[1 em]s &= \frac{57}{28}&& \\[1 em] \end{aligned} $$
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