$$3 { x }^{ 6 } +18 { x }^{ 3 } -9 { x }^{ 4 }$$
$3x^{3}\left(x^{3}-3x+6\right)$
$$3\left(x^{6}+6x^{3}-3x^{4}\right)$$
$$x^{3}\left(x^{3}+6-3x\right)$$
$$3x^{3}\left(x^{3}+6-3x\right)$$
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