Question
$$-a+4a = -16-6a+a$$
Answer
$$ a = -2 $$
Explanation
$$ \begin{aligned} -a+4a &= -16-6a+a&& \text{simplify left and right hand side} \\[1 em]3a &= -5a-16&& \text{move the $ \color{blue}{ -5a } $ to the left side} \\[1 em]3a+5a &= -16&& \text{simplify left side} \\[1 em]8a &= -16&& \text{ divide both sides by $ 8 $ } \\[1 em]a &= -\frac{16}{8}&& \\[1 em]a &= -2&& \\[1 em] \end{aligned} $$
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