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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x = (-9/3)*x+2 // - (-9/3)*x+2
6/x-((-9/3)*x)-2 = 0
3*x+6/x-2 = 0
3*x^1+6*x^-1-2*x^0 = 0
(3*x^2-2*x^1+6*x^0)/(x^1) = 0 // * x^2
x^1*(3*x^2-2*x^1+6*x^0) = 0
x^1
3*x^2-2*x+6 = 0
3*x^2-2*x+6 = 0
DELTA = (-2)^2-(3*4*6)
DELTA = -68
DELTA < 0
x in { }
x belongs to the empty set
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