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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6*x-(2/x)-2 = 2 // - 2
6*x-(2/x)-2-2 = 0
6*x-2*x^-1-2-2 = 0
6*x^1-2*x^-1-4*x^0 = 0
(6*x^2-4*x^1-2*x^0)/(x^1) = 0 // * x^2
x^1*(6*x^2-4*x^1-2*x^0) = 0
x^1
6*x^2-4*x-2 = 0
6*x^2-4*x-2 = 0
DELTA = (-4)^2-(-2*4*6)
DELTA = 64
DELTA > 0
x = (64^(1/2)+4)/(2*6) or x = (4-64^(1/2))/(2*6)
x = 1 or x = -1/3
x in { -1/3, 1}
x in { -1/3, 1 }
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