$$6x { y }^{ 2 } +18x { y }^{ 2 } -168x$$
$24x\left(y^{2}-7\right)$
$$6\left(xy^{2}+3xy^{2}-28x\right)$$
$$x\left(y^{2}+3y^{2}-28\right)$$
$$4y^{2}-28$$
$$4\left(y^{2}-7\right)$$
$$24x\left(y^{2}-7\right)$$
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