$$\frac{5}{2}x+\frac{2}{4} = \frac{9}{4}x$$

$$ \begin{aligned} \frac{5}{2}x+\frac{2}{4} &= \frac{9}{4}x&& \text{multiply ALL terms by } \color{blue}{ 4 }. \\[1 em]4 \cdot \frac{5}{2}x+4\cdot\frac{2}{4} &= 4 \cdot \frac{9}{4}x&& \text{cancel out the denominators} \\[1 em]10x+2 &= 9x&& \text{move the $ \color{blue}{ 9x } $ to the left side and $ \color{blue}{ 2 }$ to the right} \\[1 em]10x-9x &= -2&& \text{simplify left side} \\[1 em]x &= -2&& \\[1 em]x &= -2&& \\[1 em] \end{aligned} $$

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