$$3 { z }^{ 2 } { x }^{ 2 } { y }^{ 4 } -9 { z }^{ 2 } { x }^{ 2 } { y }^{ 4 }$$
$-6y^{4}\left(xz\right)^{2}$
$$-6z^{2}x^{2}y^{4}$$
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$-12xz^{2}y^{4}$
