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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+9/x = 6/5 // - 6/5
x+9/x-(6/5) = 0
x+9/x-6/5 = 0
1*x^1+9*x^-1-6/5*x^0 = 0
(1*x^2-6/5*x^1+9*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-6/5*x^1+9*x^0) = 0
x^1
x^2+(-6/5)*x+9 = 0
x^2+(-6/5)*x+9 = 0
DELTA = (-6/5)^2-(1*4*9)
DELTA = -864/25
DELTA < 0
x in { }
x belongs to the empty set
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