$$4 a + 6 b , 2 b + 3 c$$
$2\left(2a+3b\right)\left(2b+3c\right)$
$$4a+6b=2\left(2a+3b\right)$$
$$2\left(2a+3b\right)\left(2b+3c\right)$$
$$8ab+12ac+12b^{2}+18bc$$
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$4a+6b,2b+3c$