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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
64/s = 8 // - 8
64/s-8 = 0
64*s^-1 = 8 // : 64
s^-1 = 1/8
-1 < 0
1/(s^1) = 1/8 // * s^1
1 = 1/8*s^1 // : 1/8
8 = s^1
s = 8
s = 8
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