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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6*x+8/x-1 = 8 // - 8
6*x+8/x-8-1 = 0
6*x^1+8*x^-1-9*x^0 = 0
(6*x^2-9*x^1+8*x^0)/(x^1) = 0 // * x^2
x^1*(6*x^2-9*x^1+8*x^0) = 0
x^1
6*x^2-9*x+8 = 0
6*x^2-9*x+8 = 0
DELTA = (-9)^2-(4*6*8)
DELTA = -111
DELTA < 0
x in { }
x belongs to the empty set
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