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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+1/x+2 = 5/3 // - 5/3
x+1/x-(5/3)+2 = 0
x+1/x-5/3+2 = 0
1*x^1+1*x^-1+1/3*x^0 = 0
(1*x^2+1/3*x^1+1*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2+1/3*x^1+1*x^0) = 0
x^1
x^2+(1/3)*x+1 = 0
x^2+(1/3)*x+1 = 0
DELTA = (1/3)^2-(1*1*4)
DELTA = -35/9
DELTA < 0
x in { }
x belongs to the empty set
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