Question
$$6a+40 = 2a$$
Answer
$$ a = -10 $$
Explanation
$$ \begin{aligned} 6a+40 &= 2a&& \text{move the $ \color{blue}{ 2a } $ to the left side and $ \color{blue}{ 40 }$ to the right} \\[1 em]6a-2a &= -40&& \text{simplify left side} \\[1 em]4a &= -40&& \text{ divide both sides by $ 4 $ } \\[1 em]a &= -\frac{40}{4}&& \\[1 em]a &= -10&& \\[1 em] \end{aligned} $$
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