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