Question
$$\frac{31}{4}x\cdot\frac{4}{5} = 0$$
Answer
$$ x = 0 $$
Explanation
$$ \begin{aligned} \frac{31}{4}x\cdot\frac{4}{5} &= 0&& \text{multiply ALL terms by } \color{blue}{ 20 }. \\[1 em]20 \cdot \frac{31}{4}x\cdot\frac{4}{5} &= 20\cdot0&& \text{cancel out the denominators} \\[1 em]124x &= 0&& \text{ divide both sides by $ 124 $ } \\[1 em]x &= \frac{0}{124}&& \\[1 em]x &= 0&& \\[1 em] \end{aligned} $$
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