$$-10 = -10+7m$$
Answer
$$ m = 0 $$
Explanation
$$ \begin{aligned} -10 &= -10+7m&& \text{ swap the left and right side of the equation } \\[1 em]-10+7m &= -10&& \text{ move -10 to the right } \\[1 em]7m &= -10+10&& \\[1 em]7m &= 0&& \text{ divide both sides by $ 7 $ } \\[1 em]m &= \frac{0}{7}&& \\[1 em]m &= 0&& \\[1 em] \end{aligned} $$
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