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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/3-x = x+1/x+1/3 // - x+1/x+1/3
1/3-x-x-(1/x)-(1/3) = 0
1/3-x-x-x^-1-1/3 = 0
-2*x^1-1*x^-1 = 0
(-2*x^2-1*x^0)/(x^1) = 0 // * x^2
x^1*(-2*x^2-1*x^0) = 0
x^1
-2*x^2-1 = 0
-2*x^2-1 = 0
DELTA = 0^2-(-2*(-1)*4)
DELTA = -8
DELTA < 0
x in { }
x belongs to the empty set
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