Answer
$\frac{18}{x^3}$
Work Step by Step
To divide fractions, take the product of the reciprocal. This leaves $$\frac{3}{x} \cdot \frac{6}{x^2}=\frac{18}{x(x^2)}=\frac{18}{x^{1+2}}=\frac{18}{x^3}$$
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