$$\left. \begin{array} { l } { 2 x - ( 3 x + 4 ) - ( 4 a - \frac { 8 b } { 2 } ) + 5 a b - b + a } \\ { a + 2 b + 3 b - ( 4 a - \frac { 8 b } { 2 } ) + 5 a b - b + a } \end{array} \right.$$
$-5abx+2ax-8bx+25\left(ab\right)^{2}+55ab^{2}-25ba^{2}-50ab+6a^{2}+24b^{2}+8a-32b$
$-x+5ab+3b-3a-4,\ 5ab+8b-2a$
