$$ \begin{aligned} \frac{9}{4}x &= \frac{x}{28}&& \text{multiply ALL terms by } \color{blue}{ 28 }. \\[1 em]28 \cdot \frac{9}{4}x &= 28 \cdot \frac{x}{28}&& \text{cancel out the denominators} \\[1 em]63x &= x&& \text{move the $ \color{blue}{ x } $ to the left side} \\[1 em]63x-x &= 0&& \text{simplify left side} \\[1 em]62x &= 0&& \text{ divide both sides by $ 62 $ } \\[1 em]x &= \frac{0}{62}&& \\[1 em]x &= 0&& \\[1 em] \end{aligned} $$

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