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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1 = (1/x-1)*(6-6/x) // - (1/x-1)*(6-6/x)
1-((1/x-1)*(6-6/x)) = 0
1-1*(x^-1-1)*(6-6*x^-1) = 0
1-1*(x^-1-1)*(6-6*x^-1) = 0
6*x^-2-12*x^-1+7 = 0
6*x^-2-12*x^-1+7 = 0
6*x^-2-12*x^-1+7*x^0 = 0
(7*x^2-12*x^1+6*x^0)/(x^2) = 0 // * x^4
x^2*(7*x^2-12*x^1+6*x^0) = 0
x^2
7*x^2-12*x+6 = 0
7*x^2-12*x+6 = 0
DELTA = (-12)^2-(4*6*7)
DELTA = -24
DELTA < 0
x in { }
1 = 0
1 = 0
x belongs to the empty set
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