$$ \begin{aligned} \frac{3}{4}(8m-20) &= 0&& \text{simplify left side} \\[1 em]\frac{24m-60}{4} &= 0&& \text{multiply ALL terms by } \color{blue}{ 4 }. \\[1 em]4 \cdot \frac{24m-60}{4} &= 4\cdot0&& \text{cancel out the denominators} \\[1 em]24m-60 &= 0&& \text{ move the constants to the right } \\[1 em]24m &= 60&& \text{ divide both sides by $ 24 $ } \\[1 em]m &= \frac{60}{24}&& \\[1 em]m &= \frac{5}{2}&& \\[1 em] \end{aligned} $$

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