Question
$$7-3n = -2n$$
Answer
$$ n = 7 $$
Explanation
$$ \begin{aligned} 7-3n &= -2n&& \text{move the $ \color{blue}{ -2n } $ to the left side and $ \color{blue}{ 7 }$ to the right} \\[1 em]-3n+2n &= -7&& \text{simplify left side} \\[1 em]-n &= -7&& \text{switch signs on both sides} \\[1 em]n &= 7&& \\[1 em] \end{aligned} $$
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