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