Question
$$8+6a = 2a-16$$
Answer
$$ a = -6 $$
Explanation
$$ \begin{aligned} 8+6a &= 2a-16&& \text{move the $ \color{blue}{ 2a } $ to the left side and $ \color{blue}{ 8 }$ to the right} \\[1 em]6a-2a &= -16-8&& \text{simplify left and right hand side} \\[1 em]4a &= -24&& \text{ divide both sides by $ 4 $ } \\[1 em]a &= -\frac{24}{4}&& \\[1 em]a &= -6&& \\[1 em] \end{aligned} $$
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