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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
3/12 = -24/s // + -24/s
3/12-(-24/s) = 0
24*s^-1+3/12 = 0
24*s^-1 = -1/4 // : 24
s^-1 = -1/96
-1 < 0
1/(s^1) = -1/96 // * s^1
1 = -1/96*s^1 // : -1/96
-96 = s^1
s = -96
s = -96
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