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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x+2/x = 2/3 // - 2/3
2*x+2/x-(2/3) = 0
2*x+2/x-2/3 = 0
2*x^1+2*x^-1-2/3*x^0 = 0
(2*x^2-2/3*x^1+2*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-2/3*x^1+2*x^0) = 0
x^1
2*x^2+(-2/3)*x+2 = 0
2*x^2+(-2/3)*x+2 = 0
DELTA = (-2/3)^2-(2*2*4)
DELTA = -140/9
DELTA < 0
x in { }
x belongs to the empty set
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