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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
9/s = 5/2 // - 5/2
9/s-(5/2) = 0
9/s-5/2 = 0
9*s^-1 = 5/2 // : 9
s^-1 = 5/18
-1 < 0
1/(s^1) = 5/18 // * s^1
1 = 5/18*s^1 // : 5/18
18/5 = s^1
s = 18/5
s = 18/5
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