$$\frac{ { y }^{ 2 } -4y-5 }{ { y }^{ 2 } -1 }$$
$\frac{y-5}{y-1}$
$$\frac{\left(y-5\right)\left(y+1\right)}{\left(y-1\right)\left(y+1\right)}$$
$$\frac{y-5}{y-1}$$
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