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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8.5/11 = 11/x // - 11/x
8.5/11-(11/x) = 0
8.5/11-11*x^-1 = 0
-11*x^-1 = -0.77272727 // : -11
x^-1 = 0.07024793
-1 < 0
1/(x^1) = 0.07024793 // * x^1
1 = 0.07024793*x^1 // : 0.07024793
14.2352949 = x^1
x = 14.2352949
x = 14.2352949
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