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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
12/3 = 144/s // - 144/s
12/3-(144/s) = 0
12/3-144*s^-1 = 0
-144*s^-1 = -4 // : -144
s^-1 = 1/36
-1 < 0
1/(s^1) = 1/36 // * s^1
1 = 1/36*s^1 // : 1/36
36 = s^1
s = 36
s = 36
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