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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(8/(3^3))/x = 1 // - 1
(8/(3^3))/x-1 = 0
8/27*x^-1 = 1 // : 8/27
x^-1 = 27/8
-1 < 0
1/(x^1) = 27/8 // * x^1
1 = 27/8*x^1 // : 27/8
8/27 = x^1
x = 8/27
x = 8/27
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