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