Question
$$-3 = \frac{y}{7}$$
Answer
$$ y = -21 $$
Explanation
$$ \begin{aligned} -3 &= \frac{y}{7}&& \text{multiply ALL terms by } \color{blue}{ 7 }. \\[1 em]7\cdot(-3) &= 7 \cdot \frac{y}{7}&& \text{cancel out the denominators} \\[1 em]-21 &= y&& \text{ swap the left and right side of the equation } \\[1 em]y &= -21&& \\[1 em]y &= -21&& \\[1 em] \end{aligned} $$
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