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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
2.4/s = 0.3 // - 0.3
2.4/s-0.3 = 0
2.4*s^-1 = 0.3 // : 2.4
s^-1 = 0.125
-1 < 0
1/(s^1) = 0.125 // * s^1
1 = 0.125*s^1 // : 0.125
8 = s^1
s = 8
s = 8
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