$$3 { y }^{ 2 } x-9 { y }^{ 2 }$$
$3\left(x-3\right)y^{2}$
$$3\left(y^{2}x-3y^{2}\right)$$
$$y^{2}\left(x-3\right)$$
$$3y^{2}\left(x-3\right)$$
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