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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/5 = x+6/x-2 // - x+6/x-2
x/5-x-(6/x)+2 = 0
x/5-x-6*x^-1+2 = 0
2*x^0-4/5*x^1-6*x^-1 = 0
(2*x^1-4/5*x^2-6*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^1-4/5*x^2-6*x^0) = 0
x^1
(-4/5)*x^2+2*x-6 = 0
(-4/5)*x^2+2*x-6 = 0
DELTA = 2^2-(-6*4*(-4/5))
DELTA = -76/5
DELTA < 0
x in { }
x belongs to the empty set
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