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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
2.5 = 2/s // - 2/s
2.5-(2/s) = 0
2.5-2*s^-1 = 0
-2*s^-1 = -2.5 // : -2
s^-1 = 1.25
-1 < 0
1/(s^1) = 1.25 // * s^1
1 = 1.25*s^1 // : 1.25
0.8 = s^1
s = 0.8
s = 0.8
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