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D( x )
3*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x in (-oo:0) U (0:+oo)
x/24 = 8/(3*x) // - 8/(3*x)
x/24-(8/(3*x)) = 0
x/24+(-8/3)*x^-1 = 0
1/24*x^1-8/3*x^-1 = 0
(1/24*x^2-8/3*x^0)/(x^1) = 0 // * x^2
x^1*(1/24*x^2-8/3*x^0) = 0
x^1
(1/24)*x^2-8/3 = 0
(1/24)*x^2-8/3 = 0
DELTA = 0^2-(4*(1/24)*(-8/3))
DELTA = 4/9
DELTA > 0
x = ((4/9)^(1/2)+0)/(2*(1/24)) or x = (0-(4/9)^(1/2))/(2*(1/24))
x = 8 or x = -8
x in { -8, 8}
x in { -8, 8 }
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