$$ \begin{aligned} 2y+13 &= 55-y&& \text{move the $ \color{blue}{ -y } $ to the left side and $ \color{blue}{ 13 }$ to the right} \\[1 em]2y+y &= 55-13&& \text{simplify left and right hand side} \\[1 em]3y &= 42&& \text{ divide both sides by $ 3 $ } \\[1 em]y &= \frac{42}{3}&& \\[1 em]y &= 14&& \\[1 em] \end{aligned} $$
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