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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
9/9.3 = 3/s // - 3/s
9/9.3-(3/s) = 0
9/9.3-3*s^-1 = 0
-3*s^-1 = -0.96774194 // : -3
s^-1 = 0.32258065
-1 < 0
1/(s^1) = 0.32258065 // * s^1
1 = 0.32258065*s^1 // : 0.32258065
3.09999995 = s^1
s = 3.09999995
s = 3.09999995
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