$$\frac{ { x }^{ 3 } -3 { x }^{ 2 } -9x-5 }{ x+1 }$$
$\left(x-5\right)\left(x+1\right)$
$$\frac{\left(x-5\right)\left(x+1\right)^{2}}{x+1}$$
$$\left(x-5\right)\left(x+1\right)$$
$$x^{2}-4x-5$$
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$x^{2}-4x-5$
