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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X-((2/3)*x)+1 = x+2/x // - x+2/x
X-((2/3)*x)-x-(2/x)+1 = 0
X+(-2/3)*x-x-2*x^-1+1 = 0
1*x^0-5/3*x^1-2*x^-1 = 0
(1*x^1-5/3*x^2-2*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^1-5/3*x^2-2*x^0) = 0
x^1
(-5/3)*x^2+x-2 = 0
(-5/3)*x^2+x-2 = 0
DELTA = 1^2-(-2*4*(-5/3))
DELTA = -37/3
DELTA < 0
x in { }
x belongs to the empty set
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