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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
8/9 = 4/s // - 4/s
8/9-(4/s) = 0
8/9-4*s^-1 = 0
-4*s^-1 = -8/9 // : -4
s^-1 = 2/9
-1 < 0
1/(s^1) = 2/9 // * s^1
1 = 2/9*s^1 // : 2/9
9/2 = s^1
s = 9/2
s = 9/2
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