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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
8/s = 0.2 // - 0.2
8/s-0.2 = 0
8*s^-1 = 0.2 // : 8
s^-1 = 0.025
-1 < 0
1/(s^1) = 0.025 // * s^1
1 = 0.025*s^1 // : 0.025
40 = s^1
s = 40
s = 40
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