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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(2/x) = (2/3)*x-(1/3) // - (2/3)*x-(1/3)
1/3-((2/3)*x)-(2/x)+1 = 0
(-2/3)*x-2*x^-1+1/3+1 = 0
4/3*x^0-2/3*x^1-2*x^-1 = 0
(4/3*x^1-2/3*x^2-2*x^0)/(x^1) = 0 // * x^2
x^1*(4/3*x^1-2/3*x^2-2*x^0) = 0
x^1
(-2/3)*x^2+(4/3)*x-2 = 0
(-2/3)*x^2+(4/3)*x-2 = 0
DELTA = (4/3)^2-(-2*4*(-2/3))
DELTA = -32/9
DELTA < 0
x in { }
x belongs to the empty set
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