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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x+2/x-5 = 6 // - 6
2*x+2/x-6-5 = 0
2*x^1+2*x^-1-11*x^0 = 0
(2*x^2-11*x^1+2*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-11*x^1+2*x^0) = 0
x^1
2*x^2-11*x+2 = 0
2*x^2-11*x+2 = 0
DELTA = (-11)^2-(2*2*4)
DELTA = 105
DELTA > 0
x = (105^(1/2)+11)/(2*2) or x = (11-105^(1/2))/(2*2)
x = (105^(1/2)+11)/4 or x = (11-105^(1/2))/4
x in { (11-105^(1/2))/4, (105^(1/2)+11)/4}
x in { (11-105^(1/2))/4, (105^(1/2)+11)/4 }
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