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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3*x+9/x+1 = 0
3*x^1+9*x^-1+1*x^0 = 0
(3*x^2+1*x^1+9*x^0)/(x^1) = 0 // * x^2
x^1*(3*x^2+1*x^1+9*x^0) = 0
x^1
3*x^2+x+9 = 0
3*x^2+x+9 = 0
DELTA = 1^2-(3*4*9)
DELTA = -107
DELTA < 0
x in { }
x belongs to the empty set
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