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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2/3)*x+1/x = 1/6 // - 1/6
(2/3)*x+1/x-(1/6) = 0
(2/3)*x+1/x-1/6 = 0
2/3*x^1+1*x^-1-1/6*x^0 = 0
(2/3*x^2-1/6*x^1+1*x^0)/(x^1) = 0 // * x^2
x^1*(2/3*x^2-1/6*x^1+1*x^0) = 0
x^1
(2/3)*x^2+(-1/6)*x+1 = 0
(2/3)*x^2+(-1/6)*x+1 = 0
DELTA = (-1/6)^2-(1*4*(2/3))
DELTA = -95/36
DELTA < 0
x in { }
x belongs to the empty set
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