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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/11 = 9/x // - 9/x
6/11-(9/x) = 0
6/11-9*x^-1 = 0
-9*x^-1 = -6/11 // : -9
x^-1 = 2/33
-1 < 0
1/(x^1) = 2/33 // * x^1
1 = 2/33*x^1 // : 2/33
33/2 = x^1
x = 33/2
x = 33/2
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