$$15 a ^ { 2 } + 20 a b + 3 a c + 4 b c$$
$\left(5a+c\right)\left(3a+4b\right)$
$$5a\left(3a+4b\right)+c\left(3a+4b\right)$$
$$\left(3a+4b\right)\left(5a+c\right)$$
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