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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/9 = 3/x // - 3/x
8/9-(3/x) = 0
8/9-3*x^-1 = 0
-3*x^-1 = -8/9 // : -3
x^-1 = 8/27
-1 < 0
1/(x^1) = 8/27 // * x^1
1 = 8/27*x^1 // : 8/27
27/8 = x^1
x = 27/8
x = 27/8
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