$$ \begin{aligned} 9 &= 3\cdot(-16+y)&& \text{simplify right side} \\[1 em]9 &= -48+3y&& \\[1 em]9 &= 3y-48&& \text{ swap the left and right side of the equation } \\[1 em]3y-48 &= 9&& \text{ move -48 to the right } \\[1 em]3y &= 9+48&& \\[1 em]3y &= 57&& \text{ divide both sides by $ 3 $ } \\[1 em]y &= \frac{57}{3}&& \\[1 em]y &= 19&& \\[1 em] \end{aligned} $$

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