$$a+b-3ab-a+3,a-b+3$$
$\left(-a+b-3\right)\left(3ab-b-3\right)$
$$\left(-a+b-3\right)\left(3ab-b-3\right)$$
$$3ab^{2}-8ab+3a-b^{2}-3ba^{2}+9$$
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$3+b-3ab,a-b+3$
