$$4y+5 = 2y+21$$
Answer
$$ y = 8 $$
Explanation
$$ \begin{aligned} 4y+5 &= 2y+21&& \text{move the $ \color{blue}{ 2y } $ to the left side and $ \color{blue}{ 5 }$ to the right} \\[1 em]4y-2y &= 21-5&& \text{simplify left and right hand side} \\[1 em]2y &= 16&& \text{ divide both sides by $ 2 $ } \\[1 em]y &= \frac{16}{2}&& \\[1 em]y &= 8&& \\[1 em] \end{aligned} $$
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