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b)(x+1/x-3)+(x+2/3-x)-(x+3/-3-x)=2-2/x+(x+1)/3
c)(x-3/2x-2)-(x+4/2x+2)=-0,5-x-1/2x
d)(1/x-2)-(1/x)-(1/x²-2x)=-2-1/x²-2x
e)(3x²+3x/x²-1)-(x-1/6x)=3x²+3/x-5/6x