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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(2/x)-8 = 6/x-8 // - 6/x-8
x-(2/x)-(6/x)-8+8 = 0
x-2*x^-1-6*x^-1-8+8 = 0
1*x^1-8*x^-1 = 0
(1*x^2-8*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-8*x^0) = 0
x^1
x^2-8 = 0
x^2-8 = 0
DELTA = 0^2-(-8*1*4)
DELTA = 32
DELTA > 0
x = (32^(1/2)+0)/(1*2) or x = (0-32^(1/2))/(1*2)
x = 2*2^(1/2) or x = -2*2^(1/2)
x in { -2*2^(1/2), 2*2^(1/2)}
x in { -2*2^(1/2), 2*2^(1/2) }
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