Simplify each expression to lowest terms.


1. 2a - 4b +3ab -5a +2b


2. 4(2x+1) - 3x


3. 4(p - 5) +3(p +1)


4. 6(p +3q) - (7 +4q)


5. 4rs -2s - 3(rs +1) - 2s