Answer
$\frac{7}{x^{3}}$
Work Step by Step
We know that $a^{−n}=\frac{1}{a^{n}}$ (as long as a is a nonzero real number and n is an integer).
Therefore, $7x^{-3}=7\times\frac{1}{x^{3}}=\frac{7}{x^{3}}$.
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