$$ \begin{aligned} \frac{5}{4} &= -3w&& \text{multiply ALL terms by } \color{blue}{ 4 }. \\[1 em]4\cdot\frac{5}{4} &= -4\cdot3w&& \text{cancel out the denominators} \\[1 em]5 &= -12w&& \text{ swap the left and right side of the equation } \\[1 em]-12w &= 5&& \text{ divide both sides by $ -12 $ } \\[1 em]w &= -\frac{5}{12}&& \\[1 em] \end{aligned} $$

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