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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(14/5)*x-x+1/x = 5/6 // - 5/6
(14/5)*x-x+1/x-(5/6) = 0
(14/5)*x-x+1/x-5/6 = 0
9/5*x^1+1*x^-1-5/6*x^0 = 0
(9/5*x^2-5/6*x^1+1*x^0)/(x^1) = 0 // * x^2
x^1*(9/5*x^2-5/6*x^1+1*x^0) = 0
x^1
(9/5)*x^2+(-5/6)*x+1 = 0
(9/5)*x^2+(-5/6)*x+1 = 0
DELTA = (-5/6)^2-(1*4*(9/5))
DELTA = -1171/180
DELTA < 0
x in { }
x belongs to the empty set
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