$$3a-2b-2b { y }^{ 4 } +3a { y }^{ 4 }$$
$\left(3a-2b\right)\left(y^{4}+1\right)$
$$3a-2b+y^{4}\left(3a-2b\right)$$
$$\left(3a-2b\right)\left(1+y^{4}\right)$$
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