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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+x-x+2/x+1/3-1 = 0
1*x^1+2*x^-1-2/3*x^0 = 0
(1*x^2-2/3*x^1+2*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-2/3*x^1+2*x^0) = 0
x^1
x^2+(-2/3)*x+2 = 0
x^2+(-2/3)*x+2 = 0
DELTA = (-2/3)^2-(1*2*4)
DELTA = -68/9
DELTA < 0
x in { }
x belongs to the empty set
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