$$5y-9 = 8y$$
Answer
$$ y = -3 $$
Explanation
$$ \begin{aligned} 5y-9 &= 8y&& \text{move the $ \color{blue}{ 8y } $ to the left side and $ \color{blue}{ -9 }$ to the right} \\[1 em]5y-8y &= 9&& \text{simplify left side} \\[1 em]-3y &= 9&& \text{ divide both sides by $ -3 $ } \\[1 em]y &= -\frac{9}{3}&& \\[1 em]y &= -3&& \\[1 em] \end{aligned} $$
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