$$\left. \begin{array} { l } { ( x - 1 ) } \\ { ( x ^ { 2 } + x ) } \end{array} \right.$$
$x\left(x^{2}-1\right)$
$$x\left(x-1\right)\left(x+1\right)$$
$$x^{3}-x$$
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$x-1,\ x\left(x+1\right)$
