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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
20937/s = 12/4 // - 12/4
20937/s-(12/4) = 0
20937/s-3 = 0
20937*s^-1 = 3 // : 20937
s^-1 = 1/6979
-1 < 0
1/(s^1) = 1/6979 // * s^1
1 = 1/6979*s^1 // : 1/6979
6979 = s^1
s = 6979
s = 6979
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