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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7*x+6/x-6 = 6*x-(5/x)-5 // - 6*x-(5/x)-5
7*x-(6*x)+6/x+5/x-6+5 = 0
7*x-6*x+6/x+5/x-6+5 = 0
1*x^1+11*x^-1-1*x^0 = 0
(1*x^2-1*x^1+11*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-1*x^1+11*x^0) = 0
x^1
x^2-x+11 = 0
x^2-x+11 = 0
DELTA = (-1)^2-(1*4*11)
DELTA = -43
DELTA < 0
x in { }
x belongs to the empty set
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