Question
$$3 \cdot \frac{y}{2} = 15$$
Answer
$$ y = 10 $$
Explanation
$$ \begin{aligned} 3 \cdot \frac{y}{2} &= 15&& \text{multiply ALL terms by } \color{blue}{ 2 }. \\[1 em]2\cdot3 \cdot \frac{y}{2} &= 2\cdot15&& \text{cancel out the denominators} \\[1 em]3y &= 30&& \text{ divide both sides by $ 3 $ } \\[1 em]y &= \frac{30}{3}&& \\[1 em]y &= 10&& \\[1 em] \end{aligned} $$
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