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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
2.4 = 4.8/s // - 4.8/s
2.4-(4.8/s) = 0
2.4-4.8*s^-1 = 0
-4.8*s^-1 = -2.4 // : -4.8
s^-1 = 0.5
-1 < 0
1/(s^1) = 0.5 // * s^1
1 = 0.5*s^1 // : 0.5
2 = s^1
s = 2
s = 2
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