$$\frac{1}{4}x\cdot\frac{21}{2} = 0$$

$$ \begin{aligned} \frac{1}{4}x\cdot\frac{21}{2} &= 0&& \text{multiply ALL terms by } \color{blue}{ 4 }. \\[1 em]4 \cdot \frac{1}{4}x\cdot\frac{21}{2} &= 4\cdot0&& \text{cancel out the denominators} \\[1 em]\frac{21x}{2} &= 0&& \text{multiply ALL terms by } \color{blue}{ 2 }. \\[1 em]2 \cdot \frac{21x}{2} &= 2\cdot0&& \text{cancel out the denominators} \\[1 em]21x &= 0&& \text{ divide both sides by $ 21 $ } \\[1 em]x &= \frac{0}{21}&& \\[1 em]x &= 0&& \\[1 em] \end{aligned} $$

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