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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-6/x = 2*x-(16/5) // - 2*x-(16/5)
16/5-(2*x)-6/x = 0
16/5-2*x-6/x = 0
16/5*x^0-2*x^1-6*x^-1 = 0
(16/5*x^1-2*x^2-6*x^0)/(x^1) = 0 // * x^2
x^1*(16/5*x^1-2*x^2-6*x^0) = 0
x^1
(16/5)*x-2*x^2-6 = 0
(16/5)*x-2*x^2-6 = 0
DELTA = (16/5)^2-(-6*(-2)*4)
DELTA = -944/25
DELTA < 0
x in { }
x belongs to the empty set
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