Question
$$20y+12 = 6y-15$$
Answer
$$ y = -\dfrac{27}{14} $$
Explanation
$$ \begin{aligned} 20y+12 &= 6y-15&& \text{move the $ \color{blue}{ 6y } $ to the left side and $ \color{blue}{ 12 }$ to the right} \\[1 em]20y-6y &= -15-12&& \text{simplify left and right hand side} \\[1 em]14y &= -27&& \text{ divide both sides by $ 14 $ } \\[1 em]y &= -\frac{27}{14}&& \\[1 em] \end{aligned} $$
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