Question
$$-9 = -9+n$$
Answer
$$ n = 0 $$
Explanation
$$ \begin{aligned} -9 &= -9+n&& \text{ swap the left and right side of the equation } \\[1 em]-9+n &= -9&& \text{ move -9 to the right } \\[1 em]n &= -9+9&& \\[1 em]n &= 0&& \text{ divide both sides by $ 1 $ } \\[1 em]n &= \frac{0}{1}&& \\[1 em]n &= 0&& \\[1 em] \end{aligned} $$
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