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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-6 = -13/x // + -13/x
x-(-13/x)-6 = 0
x+13*x^-1-6 = 0
1*x^1+13*x^-1-6*x^0 = 0
(1*x^2-6*x^1+13*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-6*x^1+13*x^0) = 0
x^1
x^2-6*x+13 = 0
x^2-6*x+13 = 0
DELTA = (-6)^2-(1*4*13)
DELTA = -16
DELTA < 0
x in { }
x belongs to the empty set
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