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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
45/10 = 27/s // - 27/s
45/10-(27/s) = 0
45/10-27*s^-1 = 0
-27*s^-1 = -9/2 // : -27
s^-1 = 1/6
-1 < 0
1/(s^1) = 1/6 // * s^1
1 = 1/6*s^1 // : 1/6
6 = s^1
s = 6
s = 6
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