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