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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3*x-(24/x) = x/3 // - x/3
3*x-(x/3)-(24/x) = 0
3*x-(x/3)-24*x^-1 = 0
8/3*x^1-24*x^-1 = 0
(8/3*x^2-24*x^0)/(x^1) = 0 // * x^2
x^1*(8/3*x^2-24*x^0) = 0
x^1
(8/3)*x^2-24 = 0
(8/3)*x^2-24 = 0
DELTA = 0^2-(-24*4*(8/3))
DELTA = 256
DELTA > 0
x = (256^(1/2)+0)/(2*(8/3)) or x = (0-256^(1/2))/(2*(8/3))
x = 3 or x = -3
x in { -3, 3}
x in { -3, 3 }
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