$$9y+9 = 5y-7$$
Answer
$$ y = -4 $$
Explanation
$$ \begin{aligned} 9y+9 &= 5y-7&& \text{move the $ \color{blue}{ 5y } $ to the left side and $ \color{blue}{ 9 }$ to the right} \\[1 em]9y-5y &= -7-9&& \text{simplify left and right hand side} \\[1 em]4y &= -16&& \text{ divide both sides by $ 4 $ } \\[1 em]y &= -\frac{16}{4}&& \\[1 em]y &= -4&& \\[1 em] \end{aligned} $$
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