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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/x = 81 // - 81
11/x-81 = 0
11*x^-1 = 81 // : 11
x^-1 = 81/11
-1 < 0
1/(x^1) = 81/11 // * x^1
1 = 81/11*x^1 // : 81/11
11/81 = x^1
x = 11/81
x = 11/81
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