Question
$$(\frac{3}{4}+\frac{1}{7})(-\frac{2}{5}) = 0$$
Answer
This equation has no solution.
Explanation
$$ \begin{aligned} (\frac{3}{4}+\frac{1}{7})(-\frac{2}{5}) &= 0&& \text{simplify left side} \\[1 em]\frac{25}{28}(-\frac{2}{5}) &= 0&& \\[1 em]-\frac{5}{14} &= 0&& \\[1 em] \end{aligned} $$
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