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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/29 = 6/x // - 6/x
9/29-(6/x) = 0
9/29-6*x^-1 = 0
-6*x^-1 = -9/29 // : -6
x^-1 = 3/58
-1 < 0
1/(x^1) = 3/58 // * x^1
1 = 3/58*x^1 // : 3/58
58/3 = x^1
x = 58/3
x = 58/3
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