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a) (2x-3)+(3x-4)-(6x+1)=
b) (x2-3x-5)+(2x2+4x+6)+(-x2-x)=
c) (-y2-5y)-(3y2+2y-4)=
d) (x-2)-(2-x)=
e) (a+b)+(2a-b)-(a-2b)=
f) (3x-y+1)-(x+y)+(y+x)+
g) -(2a2-3ab)-(2b-3a2)+(-ab)=


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