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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+13/x+1+4 = 9/x+4 // - 9/x+4
x+13/x-(9/x)-4+1+4 = 0
x+13/x-9*x^-1-4+1+4 = 0
1*x^1+4*x^-1+1*x^0 = 0
(1*x^2+1*x^1+4*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2+1*x^1+4*x^0) = 0
x^1
x^2+x+4 = 0
x^2+x+4 = 0
DELTA = 1^2-(1*4*4)
DELTA = -15
DELTA < 0
x in { }
x belongs to the empty set
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