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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
3.5/18 = 2.8/s // - 2.8/s
3.5/18-(2.8/s) = 0
3.5/18-2.8*s^-1 = 0
-2.8*s^-1 = -0.19444444 // : -2.8
s^-1 = 0.06944444
-1 < 0
1/(s^1) = 0.06944444 // * s^1
1 = 0.06944444*s^1 // : 0.06944444
14.40000092 = s^1
s = 14.40000092
s = 14.40000092
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