$$-5ab+a2b-ab+2a2b$$
$3b\left(a_{2}-2a\right)$
$$b\left(-5a+a_{2}-a+2a_{2}\right)$$
$$-6a+3a_{2}$$
$$3\left(-2a+a_{2}\right)$$
$$3b\left(-2a+a_{2}\right)$$
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