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