$$ \begin{aligned} \frac{m}{10} &= \frac{10}{50}&& \text{multiply ALL terms by } \color{blue}{ 50 }. \\[1 em]50 \cdot \frac{m}{10} &= 50\cdot\frac{10}{50}&& \text{cancel out the denominators} \\[1 em]5m &= 10&& \text{ divide both sides by $ 5 $ } \\[1 em]m &= \frac{10}{5}&& \\[1 em]m &= 2&& \\[1 em] \end{aligned} $$
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