$$-\frac{y}{3}+19 = 33$$

$$ \begin{aligned} -\frac{y}{3}+19 &= 33&& \text{multiply ALL terms by } \color{blue}{ 3 }. \\[1 em]-3 \cdot \frac{y}{3}+3\cdot19 &= 3\cdot33&& \text{cancel out the denominators} \\[1 em]-y+57 &= 99&& \text{ move 57 to the right } \\[1 em]-y &= 99-57&& \\[1 em]-y &= 42&& \text{switch signs on both sides} \\[1 em]y &= -42&& \\[1 em] \end{aligned} $$

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