Answer
The answer is below.
Work Step by Step
First, we factor out the -3ab in the numerator:
$ \frac{(-3ab)(10a^4b^9 - 13a^3b^7)}{-3ab} $
Now, we cancel out the $-3ab$ in the numerator and denominator:
$10a^4b^9 - 13a^3b^7$
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