$$x^{3}+x(x+12)+4x^{2}$$
$x\left(x^{2}+5x+12\right)$
$$x^{3}+x^{2}+12x+4x^{2}$$
$$x^{3}+5x^{2}+12x$$
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$x^{3}+5x^{2}+12x$
