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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x+6 = x+8 // - x+8
8/x-x-8+6 = 0
8*x^-1-1*x^1-2*x^0 = 0
(8*x^0-1*x^2-2*x^1)/(x^1) = 0 // * x^2
x^1*(8*x^0-1*x^2-2*x^1) = 0
x^1
8-x^2-2*x = 0
8-x^2-2*x = 0
DELTA = (-2)^2-(-1*4*8)
DELTA = 36
DELTA > 0
x = (36^(1/2)+2)/(-1*2) or x = (2-36^(1/2))/(-1*2)
x = -4 or x = 2
x in { -4, 2}
x in { -4, 2 }
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