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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
-1/s = 3 // - 3
-1/s-3 = 0
-1*s^-1 = 3 // : -1
s^-1 = -3
-1 < 0
1/(s^1) = -3 // * s^1
1 = -3*s^1 // : -3
-1/3 = s^1
s = -1/3
s = -1/3
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