$$3y+8 = 3+y$$
Answer
$$ y = -\frac{5}{2} $$
Explanation
$$ \begin{aligned} 3y+8 &= 3+y&& \text{move the $ \color{blue}{ y } $ to the left side and $ \color{blue}{ 8 }$ to the right} \\[1 em]3y-y &= 3-8&& \text{simplify left and right hand side} \\[1 em]2y &= -5&& \text{ divide both sides by $ 2 $ } \\[1 em]y &= -\frac{5}{2}&& \\[1 em] \end{aligned} $$
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