$$ \begin{aligned} \frac{3}{4}-\frac{m}{9} &= \frac{7}{36}&& \text{multiply ALL terms by } \color{blue}{ 36 }. \\[1 em]36\cdot\frac{3}{4}-36\frac{m}{9} &= 36\cdot\frac{7}{36}&& \text{cancel out the denominators} \\[1 em]27-4m &= 7&& \text{ move 27 to the right } \\[1 em]-4m &= 7-27&& \\[1 em]-4m &= -20&& \text{ divide both sides by $ -4 $ } \\[1 em]m &= \frac{-20}{-4}&& \\[1 em]m &= 5&& \\[1 em] \end{aligned} $$

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