$$ \begin{aligned} 5a-\frac{3}{4}+\frac{3}{4}a &= 0&& \text{multiply ALL terms by } \color{blue}{ 4 }. \\[1 em]4\cdot5a-4\cdot\frac{3}{4}+4\frac{3}{4}a &= 4\cdot0&& \text{cancel out the denominators} \\[1 em]20a-3+3a &= 0&& \text{simplify left side} \\[1 em]23a-3 &= 0&& \text{ move the constants to the right } \\[1 em]23a &= 3&& \text{ divide both sides by $ 23 $ } \\[1 em]a &= \frac{3}{23}&& \\[1 em] \end{aligned} $$

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