Question
$$\frac{y}{5}+7 = 9$$
Answer
$$ y = 10 $$
Explanation
$$ \begin{aligned} \frac{y}{5}+7 &= 9&& \text{multiply ALL terms by } \color{blue}{ 5 }. \\[1 em]5 \cdot \frac{y}{5}+5\cdot7 &= 5\cdot9&& \text{cancel out the denominators} \\[1 em]y+35 &= 45&& \text{ move 35 to the right } \\[1 em]y &= 45-35&& \\[1 em]y &= 10&& \\[1 em]y &= 10&& \\[1 em] \end{aligned} $$
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