Question
Divide:
$\frac{-7}{8}\ \text{by}\ \frac{-21}{16}$

Answer

$\frac{-7}{8}\ \text{by}\ \frac{-21}{16}=\frac{-7}{8}\div\frac{-21}{16}$
$=\frac{-7}{8}\times\frac{16}{-21}=\frac{-1\times2}{1\times(-3)}$
$=\frac{-2}{-3}=\frac{2}{3}$

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