$$\left. \begin{array} { l } { 7 x + 4 5 x + 9 } \\ { 3 a b + 2 b c 4 a b - b c } \\ { 7 a ^ { 2 } + 2 a b - 3 b ^ { 2 } 2 a ^ { 2 } + 3 a } \end{array} \right.$$
$ab\left(2abc_{4}+3a-c\right)\left(27+63a+18b-54ab^{2}+156x+364ax+104bx-312axb^{2}\right)$
$52x+9,\ b\left(2abc_{4}+3a-c\right),\ a\left(3+7a+2b-6ab^{2}\right)$
