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b)2a-3b+3a-2b=5a-5b
c)2y-6y+4x-2x=-4y+2x
d)2x+3-6x-10=-4x-7
e)-x+2x+(-6)+x-4=2x-10
f)2ab-6-ab-(-3)=ab-3
g)3x²-2y²-6x²-2y²=-3x^2-4y^2
h)3,5b-2,4c-0,6c-0,5b=3b-3c
i)3x²-2x+1+x-4x²-2=-1x^2-x-1
j)2m²+3mn-n+mn+3n-m² =m^2+4mn+2n