$$\frac{5}{4}-3a = 0$$

$$ \begin{aligned} \frac{5}{4}-3a &= 0&& \text{multiply ALL terms by } \color{blue}{ 4 }. \\[1 em]4\cdot\frac{5}{4}-4\cdot3a &= 4\cdot0&& \text{cancel out the denominators} \\[1 em]5-12a &= 0&& \text{ move the constants to the right } \\[1 em]-12a &= -5&& \text{ divide both sides by $ -12 $ } \\[1 em]a &= \frac{-5}{-12}&& \\[1 em]a &= \frac{5}{12}&& \\[1 em] \end{aligned} $$

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