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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
6/s = 3 // - 3
6/s-3 = 0
6*s^-1 = 3 // : 6
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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