Question
$$\frac{21}{7}\cdot\frac{12}{4} = 0$$
Answer
This equation has no solution.
Explanation
$$ \begin{aligned} \frac{21}{7}\cdot\frac{12}{4} &= 0&& \text{multiply ALL terms by } \color{blue}{ 28 }. \\[1 em]28 \cdot \frac{21}{7}\cdot\frac{12}{4} &= 28\cdot0&& \text{cancel out the denominators} \\[1 em]252 &= 0&& \\[1 em] \end{aligned} $$
Since the statement $ \color{red}{ 252 = 0 } $ is FALSE, we conclude that the equation has no solution.
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