Question
$$\frac{y}{3}-7 = 15$$
Answer
$$ y = 66 $$
Explanation
$$ \begin{aligned} \frac{y}{3}-7 &= 15&& \text{multiply ALL terms by } \color{blue}{ 3 }. \\[1 em]3 \cdot \frac{y}{3}-3\cdot7 &= 3\cdot15&& \text{cancel out the denominators} \\[1 em]y-21 &= 45&& \text{ move -21 to the right } \\[1 em]y &= 45+21&& \\[1 em]y &= 66&& \\[1 em]y &= 66&& \\[1 em] \end{aligned} $$
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