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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
(0.5*4.5)/s = 7.5 // - 7.5
(0.5*4.5)/s-7.5 = 0
2.25*s^-1 = 7.5 // : 2.25
s^-1 = 3.33333333
-1 < 0
1/(s^1) = 3.33333333 // * s^1
1 = 3.33333333*s^1 // : 3.33333333
0.3 = s^1
s = 0.3
s = 0.3
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