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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x-9 = 11/12 // - 11/12
6/x-(11/12)-9 = 0
6/x-11/12-9 = 0
6*x^-1 = 119/12 // : 6
x^-1 = 119/72
-1 < 0
1/(x^1) = 119/72 // * x^1
1 = 119/72*x^1 // : 119/72
72/119 = x^1
x = 72/119
x = 72/119
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