Answer
$(\frac{m}{n})^{7}$
Work Step by Step
$\frac{m^{7}}{n^{7}}$ can be written as $(\frac{m}{n})^{7}$
(since ($\frac{a}{b})^{x}=$ $\frac{a^{x}}{b^{x}}$ and vice versa)
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