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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
3/s = 7 // - 7
3/s-7 = 0
3*s^-1 = 7 // : 3
s^-1 = 7/3
-1 < 0
1/(s^1) = 7/3 // * s^1
1 = 7/3*s^1 // : 7/3
3/7 = s^1
s = 3/7
s = 3/7
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