$$ \begin{aligned} \frac{3}{4}(5x+20) &= 8&& \text{simplify left side} \\[1 em]\frac{15x+60}{4} &= 8&& \text{multiply ALL terms by } \color{blue}{ 4 }. \\[1 em]4 \cdot \frac{15x+60}{4} &= 4\cdot8&& \text{cancel out the denominators} \\[1 em]15x+60 &= 32&& \text{ move 60 to the right } \\[1 em]15x &= 32-60&& \\[1 em]15x &= -28&& \text{ divide both sides by $ 15 $ } \\[1 em]x &= -\frac{28}{15}&& \\[1 em] \end{aligned} $$

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