$$ \begin{aligned} y+\frac{4}{5} &= \frac{12}{3}&& \text{multiply ALL terms by } \color{blue}{ 15 }. \\[1 em]15y+15\cdot\frac{4}{5} &= 15\cdot\frac{12}{3}&& \text{cancel out the denominators} \\[1 em]15y+12 &= 60&& \text{ move 12 to the right } \\[1 em]15y &= 60-12&& \\[1 em]15y &= 48&& \text{ divide both sides by $ 15 $ } \\[1 em]y &= \frac{48}{15}&& \\[1 em]y &= \frac{16}{5}&& \\[1 em] \end{aligned} $$

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