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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6*x-(24/x) = 0
6*x-24*x^-1 = 0
6*x^1-24*x^-1 = 0
(6*x^2-24*x^0)/(x^1) = 0 // * x^2
x^1*(6*x^2-24*x^0) = 0
x^1
6*x^2-24 = 0
6*x^2-24 = 0
DELTA = 0^2-(-24*4*6)
DELTA = 576
DELTA > 0
x = (576^(1/2)+0)/(2*6) or x = (0-576^(1/2))/(2*6)
x = 2 or x = -2
x in { -2, 2}
x in { -2, 2 }
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