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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
3/s-4 = 2 // - 2
3/s-4-2 = 0
3*s^-1 = 6 // : 3
s^-1 = 2
-1 < 0
1/(s^1) = 2 // * s^1
1 = 2*s^1 // : 2
1/2 = s^1
s = 1/2
s = 1/2
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