Question
$$14+15y = 20y-21$$
Answer
$$ y = 7 $$
Explanation
$$ \begin{aligned} 14+15y &= 20y-21&& \text{move the $ \color{blue}{ 20y } $ to the left side and $ \color{blue}{ 14 }$ to the right} \\[1 em]15y-20y &= -21-14&& \text{simplify left and right hand side} \\[1 em]-5y &= -35&& \text{ divide both sides by $ -5 $ } \\[1 em]y &= \frac{-35}{-5}&& \\[1 em]y &= 7&& \\[1 em] \end{aligned} $$
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