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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
6/s = 15/17.5 // - 15/17.5
6/s-(15/17.5) = 0
6/s-0.85714286 = 0
6*s^-1 = 0.85714286 // : 6
s^-1 = 0.14285714
-1 < 0
1/(s^1) = 0.14285714 // * s^1
1 = 0.14285714*s^1 // : 0.14285714
7.00000014 = s^1
s = 7.00000014
s = 7.00000014
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