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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
(-31/2)/s = 13/4 // - 13/4
(-31/2)/s-(13/4) = 0
(-31/2)/s-13/4 = 0
-31/2*s^-1 = 13/4 // : -31/2
s^-1 = -13/62
-1 < 0
1/(s^1) = -13/62 // * s^1
1 = -13/62*s^1 // : -13/62
-62/13 = s^1
s = -62/13
s = -62/13
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