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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
2/s = 3/18 // - 3/18
2/s-(3/18) = 0
2/s-1/6 = 0
2*s^-1 = 1/6 // : 2
s^-1 = 1/12
-1 < 0
1/(s^1) = 1/12 // * s^1
1 = 1/12*s^1 // : 1/12
12 = s^1
s = 12
s = 12
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