$$2 { x }^{ 2 } z+2 { x }^{ 3 }$$
$2\left(x+z\right)x^{2}$
$$2\left(x^{2}z+x^{3}\right)$$
$$x^{2}\left(z+x\right)$$
$$2x^{2}\left(x+z\right)$$
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