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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/x-16 = 81 // - 81
9/x-81-16 = 0
9*x^-1 = 97 // : 9
x^-1 = 97/9
-1 < 0
1/(x^1) = 97/9 // * x^1
1 = 97/9*x^1 // : 97/9
9/97 = x^1
x = 9/97
x = 9/97
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