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