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b)(4a+2b-7)-(a-3b-4)-(2a-b-3)=4a+2b-7-a+3b-4-2a+b+3=5a+4b-8
c)-(-2a-5b-4)+(2a-3b-4)-(-3a-b+2)=2a+5b+4+2a-3b-4+3a+b-2=7a+3b-2
d)(-5a+b-3)-(2a-3b+5)-(4a-b-8)=-5a+b-3-2a+3b-5-4a+b+8=-11a+5b