Question
$$\frac{42}{3}x\cdot\frac{21}{4} = 0$$
Answer
$$ x = 0 $$
Explanation
$$ \begin{aligned} \frac{42}{3}x\cdot\frac{21}{4} &= 0&& \text{multiply ALL terms by } \color{blue}{ 12 }. \\[1 em]12 \cdot \frac{42}{3}x\cdot\frac{21}{4} &= 12\cdot0&& \text{cancel out the denominators} \\[1 em]882x &= 0&& \text{ divide both sides by $ 882 $ } \\[1 em]x &= \frac{0}{882}&& \\[1 em]x &= 0&& \\[1 em] \end{aligned} $$
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