$$\frac{ { x }^{ 2 } +6-7 }{ { x }^{ 2 } -7x+6 }$$
$\frac{x+1}{x-6}$
$$\frac{x^{2}-1}{x^{2}-7x+6}$$
$$\frac{\left(x-1\right)\left(x+1\right)}{\left(x-6\right)\left(x-1\right)}$$
$$\frac{x+1}{x-6}$$
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