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Question
$$\frac{78}{100}\cdot\frac{3}{4} = 0$$
Answer
This equation has no solution.
Explanation
$$ \begin{aligned} \frac{78}{100}\cdot\frac{3}{4} &= 0&& \text{multiply ALL terms by } \color{blue}{ 100 }. \\[1 em]100 \cdot \frac{78}{100}\cdot\frac{3}{4} &= 100\cdot0&& \text{cancel out the denominators} \\[1 em]\frac{117}{2} &= 0&& \\[1 em] \end{aligned} $$
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