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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
209/s = -11 // + 11
209/s+11 = 0
209*s^-1 = -11 // : 209
s^-1 = -1/19
-1 < 0
1/(s^1) = -1/19 // * s^1
1 = -1/19*s^1 // : -1/19
-19 = s^1
s = -19
s = -19
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