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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6-(5*x) = 6/x // - 6/x
6-(5*x)-(6/x) = 0
6-5*x-6*x^-1 = 0
6*x^0-5*x^1-6*x^-1 = 0
(6*x^1-5*x^2-6*x^0)/(x^1) = 0 // * x^2
x^1*(6*x^1-5*x^2-6*x^0) = 0
x^1
6*x-5*x^2-6 = 0
6*x-5*x^2-6 = 0
DELTA = 6^2-(-6*(-5)*4)
DELTA = -84
DELTA < 0
x in { }
x belongs to the empty set
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