Question
$$\frac{y}{2}+9 = 30$$
Answer
$$ y = 42 $$
Explanation
$$ \begin{aligned} \frac{y}{2}+9 &= 30&& \text{multiply ALL terms by } \color{blue}{ 2 }. \\[1 em]2 \cdot \frac{y}{2}+2\cdot9 &= 2\cdot30&& \text{cancel out the denominators} \\[1 em]y+18 &= 60&& \text{ move 18 to the right } \\[1 em]y &= 60-18&& \\[1 em]y &= 42&& \\[1 em]y &= 42&& \\[1 em] \end{aligned} $$
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