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a) (a+b)-(2a-b)-(a-2b) =

b) (3x-y+1)-(x+y)+(y-x) =

c)- (kx+ny)-(3kx+2ny)+(5kx-3ny) =

d) (2ab+a+3)-(3ab-a+3) =

e) (4x²-3x)-(x+0,1x²)-(x²-0,1x) =
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