Question
$$-5x\cdot\frac{4}{20} = 0$$
Answer
$$ x = 0 $$
Explanation
$$ \begin{aligned} -5x\cdot\frac{4}{20} &= 0&& \text{multiply ALL terms by } \color{blue}{ 20 }. \\[1 em]-205x\cdot\frac{4}{20} &= 20\cdot0&& \text{cancel out the denominators} \\[1 em]-20x &= 0&& \text{ divide both sides by $ -20 $ } \\[1 em]x &= \frac{0}{-20}&& \\[1 em]x &= 0&& \\[1 em] \end{aligned} $$
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