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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/6+4/x-(x/x)-4+4 = 0
x/6+4/x-4-1+4 = 0
1/6*x^1+4*x^-1-1*x^0 = 0
(1/6*x^2-1*x^1+4*x^0)/(x^1) = 0 // * x^2
x^1*(1/6*x^2-1*x^1+4*x^0) = 0
x^1
(1/6)*x^2-x+4 = 0
(1/6)*x^2-x+4 = 0
DELTA = (-1)^2-(4*4*(1/6))
DELTA = -5/3
DELTA < 0
x in { }
x belongs to the empty set
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