$$\frac { 3 x - 3 y } { a x - a y - x + y }$$
$\frac{3}{a-1}$
$$\frac{3\left(x-y\right)}{\left(a-1\right)\left(x-y\right)}$$
$$\frac{3}{a-1}$$
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$-\frac{3}{1-a}$
