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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16/9 = 6/x // - 6/x
16/9-(6/x) = 0
16/9-6*x^-1 = 0
-6*x^-1 = -16/9 // : -6
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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