Question
$$-6n+21 = 12n-15$$
Answer
$$ n = 2 $$
Explanation
$$ \begin{aligned} -6n+21 &= 12n-15&& \text{move the $ \color{blue}{ 12n } $ to the left side and $ \color{blue}{ 21 }$ to the right} \\[1 em]-6n-12n &= -15-21&& \text{simplify left and right hand side} \\[1 em]-18n &= -36&& \text{ divide both sides by $ -18 $ } \\[1 em]n &= \frac{-36}{-18}&& \\[1 em]n &= 2&& \\[1 em] \end{aligned} $$
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