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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
21/s = 7 // - 7
21/s-7 = 0
21*s^-1 = 7 // : 21
s^-1 = 1/3
-1 < 0
1/(s^1) = 1/3 // * s^1
1 = 1/3*s^1 // : 1/3
3 = s^1
s = 3
s = 3
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