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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
384/s = 24 // - 24
384/s-24 = 0
384*s^-1 = 24 // : 384
s^-1 = 1/16
-1 < 0
1/(s^1) = 1/16 // * s^1
1 = 1/16*s^1 // : 1/16
16 = s^1
s = 16
s = 16
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