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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/9 = 11/x // - 11/x
8/9-(11/x) = 0
8/9-11*x^-1 = 0
-11*x^-1 = -8/9 // : -11
x^-1 = 8/99
-1 < 0
1/(x^1) = 8/99 // * x^1
1 = 8/99*x^1 // : 8/99
99/8 = x^1
x = 99/8
x = 99/8
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