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a) (3x-y+1)-(x+y)+(y-x)=3x-y+1-x-y+y-x=x-y+1
B) -(2a²-3ab)-(2b-3a²)+(-ab-b)=-2a²+3ab-2b+3a²-ab-b=a²+2ab-3b
2.
a) 4x-(x+6)+4=4x-x-6=3x-6=3x⅓-6=1-6=-5
b)(x²+1)-(x²-2)+10=x²+1-x²+2=3