Answer
$\frac{1}{x^{19}}$
Work Step by Step
Step 1: $\frac{x^{-7}}{(x^{4})^{3}}$
Step 2: $\frac{x^{-7}}{x^{12}}$
Step 3: $\frac{1}{x^{12+7}}$
Step 4: $\frac{1}{x^{19}}$
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