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b. 2a²+3ab-7-5a²+2ab-4= 2a²-5a²+3ab+2ab-7-4= 15a²+5ab-11
c. 4x²-5x²-3xy+2xy+7y-4y= -x²-xy+3y
d. -4p²-6p²+3pq+8pq-2-3= -10p²+11pq-5
e. 12kl-5kl-20mn-3mn= 7kl-17mn