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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/11 = 9/x // - 9/x
5/11-(9/x) = 0
5/11-9*x^-1 = 0
-9*x^-1 = -5/11 // : -9
x^-1 = 5/99
-1 < 0
1/(x^1) = 5/99 // * x^1
1 = 5/99*x^1 // : 5/99
99/5 = x^1
x = 99/5
x = 99/5
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