Question
$$-7+7n = 9n+9$$
Answer
$$ n = -8 $$
Explanation
$$ \begin{aligned} -7+7n &= 9n+9&& \text{move the $ \color{blue}{ 9n } $ to the left side and $ \color{blue}{ -7 }$ to the right} \\[1 em]7n-9n &= 9+7&& \text{simplify left and right hand side} \\[1 em]-2n &= 16&& \text{ divide both sides by $ -2 $ } \\[1 em]n &= -\frac{16}{2}&& \\[1 em]n &= -8&& \\[1 em] \end{aligned} $$
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