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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
66.792/s = 9.2 // - 9.2
66.792/s-9.2 = 0
66.792*s^-1 = 9.2 // : 66.792
s^-1 = 0.13774105
-1 < 0
1/(s^1) = 0.13774105 // * s^1
1 = 0.13774105*s^1 // : 0.13774105
7.25999983 = s^1
s = 7.25999983
s = 7.25999983
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