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b) (a+b)+(2a-b)-(a-2b)= a+b+2a-b-a+2b= 4a-2b
c) (3x-y+1)-(x+y)+(y-x)= 3x-y+1-x-y+y-x= 1+x-y
d) -(2a²-3ab)-(2b-3a²)+(-ab-b)= -2a²+3ab-2b+3a²-ab-b= a²+2ab-3b