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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(24/(x^2))*x = 8 // - 8
(24/(x^2))*x-8 = 0
24*x^-1 = 8 // : 24
x^-1 = 1/3
-1 < 0
1/(x^1) = 1/3 // * x^1
1 = 1/3*x^1 // : 1/3
3 = x^1
x = 3
x = 3
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