$\frac{6 a^{-5}}{3 a^{-3}}$
First, we can simplify the numerator and denominator separately.
In the numerator, we have $6 a^{-5}$. To simplify this, we can use the rule $a^{-n} = \frac{1}{a^n}$. So, $a^{-5} = \frac{1}{a^5}$. Therefore, the numerator simplifies
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