$$3 a + b , 2 a + 4 b , 5 a - b$$
$-2\left(5a-b\right)\left(a+2b\right)\left(3a+b\right)$
$$2a+4b=2\left(a+2b\right)$$
$$-2\left(5a-b\right)\left(a+2b\right)\left(3a+b\right)$$
$$-30a^{3}-6ab^{2}+4b^{3}-64ba^{2}$$
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$3a+b,2\left(a+2b\right),5a-b$
