Simplify the given expression completely.
21
a
9
b
10
−
9
a
3
b
6
=
\displaystyle \frac{{{21}{a}^{{9}}{b}^{{10}}}}{{-{9}{a}^{{3}}{b}^{{6}}}}=
−
9
a
3
b
6
21
a
9
b
10
=
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