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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5*x-((6/5)*x) = 9/5-(6/x) // - 9/5-(6/x)
5*x-((6/5)*x)+6/x-(9/5) = 0
5*x+(-6/5)*x+6/x-9/5 = 0
19/5*x^1+6*x^-1-9/5*x^0 = 0
(19/5*x^2-9/5*x^1+6*x^0)/(x^1) = 0 // * x^2
x^1*(19/5*x^2-9/5*x^1+6*x^0) = 0
x^1
(19/5)*x^2+(-9/5)*x+6 = 0
(19/5)*x^2+(-9/5)*x+6 = 0
DELTA = (-9/5)^2-(4*6*(19/5))
DELTA = -2199/25
DELTA < 0
x in { }
x belongs to the empty set
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