Answer
$\frac{x^{2}}{8z^{7}}$
Work Step by Step
Recall the equation: $a^{-n}= \frac{1}{a^{n}}$. Thus, we simplify this expression:
$2^{-3}x^{2}z^{-7}=\frac{x^{2}}{8z^{7}}$
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