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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
2/3 = 5/s // - 5/s
2/3-(5/s) = 0
2/3-5*s^-1 = 0
-5*s^-1 = -2/3 // : -5
s^-1 = 2/15
-1 < 0
1/(s^1) = 2/15 // * s^1
1 = 2/15*s^1 // : 2/15
15/2 = s^1
s = 15/2
s = 15/2
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