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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
9/s = 5 // - 5
9/s-5 = 0
9*s^-1 = 5 // : 9
s^-1 = 5/9
-1 < 0
1/(s^1) = 5/9 // * s^1
1 = 5/9*s^1 // : 5/9
9/5 = s^1
s = 9/5
s = 9/5
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