$$3a- { b }^{ 2 } +2 { b }^{ 2 } x-6ax$$
$\left(1-2x\right)\left(3a-b^{2}\right)$
$$3a-b^{2}-2x\left(3a-b^{2}\right)$$
$$\left(3a-b^{2}\right)\left(1-2x\right)$$
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