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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
3/s = 5/18 // - 5/18
3/s-(5/18) = 0
3/s-5/18 = 0
3*s^-1 = 5/18 // : 3
s^-1 = 5/54
-1 < 0
1/(s^1) = 5/54 // * s^1
1 = 5/54*s^1 // : 5/54
54/5 = s^1
s = 54/5
s = 54/5
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