IMathAS-libretexts

Simplify:

$\displaystyle \frac{{{\left({a}^{{7}}{b}^{{-{{7}}}}\right)}^{{-{{1}}}}{\left({a}^{{-{{1}}}}\right)}^{{3}}}}{{\left({a}{b}^{{9}}\right)}^{{-{{9}}}}}$

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\displaystyle

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