$$f(x)= \frac{ { x }^{ 2 } -8x+15 }{ { x }^{ 2 } -6x+5 }$$
$\frac{x-3}{x-1}$
$$\frac{\left(x-5\right)\left(x-3\right)}{\left(x-5\right)\left(x-1\right)}$$
$$\frac{x-3}{x-1}$$
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