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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/3-(2*x) = 2/x // - 2/x
8/3-(2*x)-(2/x) = 0
8/3-2*x-2*x^-1 = 0
8/3*x^0-2*x^1-2*x^-1 = 0
(8/3*x^1-2*x^2-2*x^0)/(x^1) = 0 // * x^2
x^1*(8/3*x^1-2*x^2-2*x^0) = 0
x^1
(8/3)*x-2*x^2-2 = 0
(8/3)*x-2*x^2-2 = 0
DELTA = (8/3)^2-(-2*(-2)*4)
DELTA = -80/9
DELTA < 0
x in { }
x belongs to the empty set
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