Question
$$-7 = \frac{s}{4}$$
Answer
$$ s = -28 $$
Explanation
$$ \begin{aligned} -7 &= \frac{s}{4}&& \text{multiply ALL terms by } \color{blue}{ 4 }. \\[1 em]4\cdot(-7) &= 4 \cdot \frac{s}{4}&& \text{cancel out the denominators} \\[1 em]-28 &= s&& \text{ swap the left and right side of the equation } \\[1 em]s &= -28&& \\[1 em]s &= -28&& \\[1 em] \end{aligned} $$
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