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D( s )
1-(2*s) = 0
1-(2*s) = 0
1-(2*s) = 0
1-2*s = 0
1-2*s = 0 // - 1
-2*s = -1 // : -2
s = -1/(-2)
s = 1/2
s in (-oo:1/2) U (1/2:+oo)
2/(1-(2*s)) = 3.5*10^-3 // - 3.5*10^-3
2/(1-(2*s))-(3.5*10^-3) = 0
2/(1-2*s)-3.5*10^-3 = 0
2/(1-2*s)-0.0035 = 0
2/(1-2*s)+(-0.0035*(1-2*s))/(1-2*s) = 0
2-0.0035*(1-2*s) = 0
0.007*s+1.9965 = 0
(0.007*s+1.9965)/(1-2*s) = 0
(0.007*s+1.9965)/(1-2*s) = 0 // * 1-2*s
0.007*s+1.9965 = 0
0.007*s+1.9965 = 0 // - 1.9965
0.007*s = -1.9965 // : 0.007
s = -1.9965/0.007
s = -285.21428571
s = -285.21428571
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