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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+1/x+x/x+1 = 13/6 // - 13/6
x+1/x+x/x-(13/6)+1 = 0
x+1/x+x/x-13/6+1 = 0
1*x^1+1*x^-1-1/6*x^0 = 0
(1*x^2-1/6*x^1+1*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-1/6*x^1+1*x^0) = 0
x^1
x^2+(-1/6)*x+1 = 0
x^2+(-1/6)*x+1 = 0
DELTA = (-1/6)^2-(1*1*4)
DELTA = -143/36
DELTA < 0
x in { }
x belongs to the empty set
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