$$\frac { a ^ { 2 } - 6 a + 9 } { a ^ { 2 } - 9 }$$
$\frac{a-3}{a+3}$
$$\frac{\left(a-3\right)^{2}}{\left(a-3\right)\left(a+3\right)}$$
$$\frac{a-3}{a+3}$$
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