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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
4/s-3 = -2/5 // + -2/5
4/s-(-2/5)-3 = 0
4/s+2/5-3 = 0
4*s^-1 = 13/5 // : 4
s^-1 = 13/20
-1 < 0
1/(s^1) = 13/20 // * s^1
1 = 13/20*s^1 // : 13/20
20/13 = s^1
s = 20/13
s = 20/13
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