$${ y }^{ 2 } -12xy+9 { y }^{ 2 }$$
$2y\left(5y-6x\right)$
$$y\left(y-12x+9y\right)$$
$$-12x+10y$$
$$2\left(-6x+5y\right)$$
$$2y\left(-6x+5y\right)$$
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$$10y^{2}-12xy$$