$$\left. \begin{array} { l } { 3 a + b , 2 a + 4 b , 5 a - b } \\ { 5 a - 4 , 2 a + 3 , 2 a - 4 } \\ { 6 a ^ { 2 } + 7 a + 2 } \end{array} \right.$$
$-2\left(a-2\right)\left(5a-4\right)\left(2a+1\right)\left(2a+3\right)\left(3a+2\right)\left(5a-b\right)\left(a+2b\right)\left(3a+b\right)$
$3a+b,\ 2\left(a+2b\right),\ 5a-b,\ 5a-4,\ 2a+3,\ 2\left(a-2\right),\ \left(2a+1\right)\left(3a+2\right)$
