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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
4/s = -2/9 // + -2/9
4/s-(-2/9) = 0
4/s+2/9 = 0
4*s^-1 = -2/9 // : 4
s^-1 = -1/18
-1 < 0
1/(s^1) = -1/18 // * s^1
1 = -1/18*s^1 // : -1/18
-18 = s^1
s = -18
s = -18
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