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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/11 = 27/x // - 27/x
3/11-(27/x) = 0
3/11-27*x^-1 = 0
-27*x^-1 = -3/11 // : -27
x^-1 = 1/99
-1 < 0
1/(x^1) = 1/99 // * x^1
1 = 1/99*x^1 // : 1/99
99 = x^1
x = 99
x = 99
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