$$8y-20 = 4y$$
Answer
$$ y = 5 $$
Explanation
$$ \begin{aligned} 8y-20 &= 4y&& \text{move the $ \color{blue}{ 4y } $ to the left side and $ \color{blue}{ -20 }$ to the right} \\[1 em]8y-4y &= 20&& \text{simplify left side} \\[1 em]4y &= 20&& \text{ divide both sides by $ 4 $ } \\[1 em]y &= \frac{20}{4}&& \\[1 em]y &= 5&& \\[1 em] \end{aligned} $$
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