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D( s )
s-8 = 0
5*s+3 = 0
s-8 = 0
s-8 = 0
s-8 = 0 // + 8
s = 8
5*s+3 = 0
5*s+3 = 0
5*s+3 = 0 // - 3
5*s = -3 // : 5
s = -3/5
s in (-oo:-3/5) U (-3/5:8) U (8:+oo)
7/(s-8) = -3/(5*s+3) // + -3/(5*s+3)
7/(s-8)-(-3/(5*s+3)) = 0
7/(s-8)+3*(5*s+3)^-1 = 0
7/(s-8)+3/(5*s+3) = 0
(7*(5*s+3))/((s-8)*(5*s+3))+(3*(s-8))/((s-8)*(5*s+3)) = 0
7*(5*s+3)+3*(s-8) = 0
38*s-3 = 0
(38*s-3)/((s-8)*(5*s+3)) = 0
(38*s-3)/((s-8)*(5*s+3)) = 0 // * (s-8)*(5*s+3)
38*s-3 = 0
38*s-3 = 0 // + 3
38*s = 3 // : 38
s = 3/38
s = 3/38
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