3a-2b-ab-(a-b+ab}+3ab+b-a 

Dear Student!

3a – 2b – ab – (a – b + ab) + 3ab + b – a

= 3a – 2b – ab – a + b – ab + 3ab + b – a

= (3a – a – a) + (–2b + b + b) + (– ab – ab + 3ab)

= (3a – 2a) + (–2b + 2b) + (– 2ab + 3ab)

= a + 0 + ab

= a + ab

Thus, the simplified value of the given expression is a + ab.

Cheers!