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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/6 = 9/x // - 9/x
8/6-(9/x) = 0
8/6-9*x^-1 = 0
-9*x^-1 = -4/3 // : -9
x^-1 = 4/27
-1 < 0
1/(x^1) = 4/27 // * x^1
1 = 4/27*x^1 // : 4/27
27/4 = x^1
x = 27/4
x = 27/4
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