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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
5/s = 10/14 // - 10/14
5/s-(10/14) = 0
5/s-5/7 = 0
5*s^-1 = 5/7 // : 5
s^-1 = 1/7
-1 < 0
1/(s^1) = 1/7 // * s^1
1 = 1/7*s^1 // : 1/7
7 = s^1
s = 7
s = 7
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