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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-x-(6/3) = 0
1/x-x-2 = 0
1*x^-1-1*x^1-2*x^0 = 0
(1*x^0-1*x^2-2*x^1)/(x^1) = 0 // * x^2
x^1*(1*x^0-1*x^2-2*x^1) = 0
x^1
1-x^2-2*x = 0
1-x^2-2*x = 0
DELTA = (-2)^2-(-1*1*4)
DELTA = 8
DELTA > 0
x = (8^(1/2)+2)/(-1*2) or x = (2-8^(1/2))/(-1*2)
x = (2*2^(1/2)+2)/(-2) or x = (2-2*2^(1/2))/(-2)
x in { (2*2^(1/2)+2)/(-2), (2-2*2^(1/2))/(-2)}
x in { (2*2^(1/2)+2)/(-2), (2-2*2^(1/2))/(-2) }
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