$$ \begin{aligned} y &= 3 \cdot \frac{y}{5}+12&& \text{multiply ALL terms by } \color{blue}{ 5 }. \\[1 em]5y &= 5\cdot3 \cdot \frac{y}{5}+5\cdot12&& \text{cancel out the denominators} \\[1 em]5y &= 3y+60&& \text{move the $ \color{blue}{ 3y } $ to the left side} \\[1 em]5y-3y &= 60&& \text{simplify left side} \\[1 em]2y &= 60&& \text{ divide both sides by $ 2 $ } \\[1 em]y &= \frac{60}{2}&& \\[1 em]y &= 30&& \\[1 em] \end{aligned} $$

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