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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
870/s = 30 // - 30
870/s-30 = 0
870*s^-1 = 30 // : 870
s^-1 = 1/29
-1 < 0
1/(s^1) = 1/29 // * s^1
1 = 1/29*s^1 // : 1/29
29 = s^1
s = 29
s = 29
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