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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
10 = 20/s // - 20/s
10-(20/s) = 0
10-20*s^-1 = 0
-20*s^-1 = -10 // : -20
s^-1 = 1/2
-1 < 0
1/(s^1) = 1/2 // * s^1
1 = 1/2*s^1 // : 1/2
2 = s^1
s = 2
s = 2
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