Answer
$$\frac{a-6}{a+2}$$
Work Step by Step
Multiply and factor
$$\bigg( \frac{a^2-6a}{a^2-4}\bigg)\bigg(\frac{a-2}{a}\bigg)=$$
Cancel common factors $a$ and $(a-2)$
$$\frac{a(a-6)(a-2)}{(a-2)(a+2)a}=\frac{a-6}{a+2}$$
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