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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+3/x+x/x-8+5+5 = 0
1*x^1+3*x^-1+3*x^0 = 0
(1*x^2+3*x^1+3*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2+3*x^1+3*x^0) = 0
x^1
x^2+3*x+3 = 0
x^2+3*x+3 = 0
DELTA = 3^2-(1*3*4)
DELTA = -3
DELTA < 0
x in { }
x belongs to the empty set
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