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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x = 9/x-(1/11) // - 9/x-(1/11)
6/x-(9/x)+1/11 = 0
6/x-9*x^-1+1/11 = 0
-3*x^-1 = -1/11 // : -3
x^-1 = 1/33
-1 < 0
1/(x^1) = 1/33 // * x^1
1 = 1/33*x^1 // : 1/33
33 = x^1
x = 33
x = 33
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