$$12z { x }^{ 2 } +36 { x }^{ 2 } y+27 { y }^{ 2 } { x }^{ 2 }$$
$3x^{2}\left(9y^{2}+12y+4z\right)$
$$3\left(4zx^{2}+12x^{2}y+9y^{2}x^{2}\right)$$
$$x^{2}\left(4z+12y+9y^{2}\right)$$
$$3x^{2}\left(4z+12y+9y^{2}\right)$$
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