Answer
$\frac{z^{3}}{x^{7}}$
Work Step by Step
We are given the expression $\frac{x^{-7}}{z^{-3}}$.
$\frac{x^{-7}}{z^{-3}}=\frac{z^{3}}{x^{7}}$
In general, $x^{−b}=\frac{1}{x^{b}}$ and $\frac{1}{x^{-b}}=x^{b}$, for some number x.
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