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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/3-(1/x) = (5/3)*x // - (5/3)*x
2/3-((5/3)*x)-(1/x) = 0
(-5/3)*x-x^-1+2/3 = 0
2/3*x^0-5/3*x^1-1*x^-1 = 0
(2/3*x^1-5/3*x^2-1*x^0)/(x^1) = 0 // * x^2
x^1*(2/3*x^1-5/3*x^2-1*x^0) = 0
x^1
(-5/3)*x^2+(2/3)*x-1 = 0
(-5/3)*x^2+(2/3)*x-1 = 0
DELTA = (2/3)^2-(-1*4*(-5/3))
DELTA = -56/9
DELTA < 0
x in { }
x belongs to the empty set
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