Simplify. Write your answer without negative exponents. Assume that no denominator equals zero.
x
−
7
u
2
r
x
4
u
−
6
r
3
\displaystyle \frac{{{x}^{{-{{7}}}}{u}^{{2}}{r}}}{{{x}^{{4}}{u}^{{-{{6}}}}{r}^{{3}}}}
x
4
u
−
6
r
3
x
−
7
u
2
r
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