Question
$$\frac{m}{10}+15 = 21$$
Answer
$$ m = 60 $$
Explanation
$$ \begin{aligned} \frac{m}{10}+15 &= 21&& \text{multiply ALL terms by } \color{blue}{ 10 }. \\[1 em]10 \cdot \frac{m}{10}+10\cdot15 &= 10\cdot21&& \text{cancel out the denominators} \\[1 em]m+150 &= 210&& \text{ move 150 to the right } \\[1 em]m &= 210-150&& \\[1 em]m &= 60&& \\[1 em]m &= 60&& \\[1 em] \end{aligned} $$
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