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D( s )
0.25*s+1 = 0
0.25*s+1 = 0
0.25*s+1 = 0
0.25*s+1 = 0 // - 1
0.25*s = -1 // : 0.25
s = -1/0.25
s = -4
s in (-oo:-4) U (-4:+oo)
1/(0.25*s+1) = 0
s belongs to the empty set
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