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D( s )
s-2 = 0
s-2 = 0
s-2 = 0
s-2 = 0 // + 2
s = 2
s in (-oo:2) U (2:+oo)
1/(s-2) = 1/7 // - 1/7
1/(s-2)-(1/7) = 0
1/(s-2)-1/7 = 0
(1*7)/(7*(s-2))+(-1*(s-2))/(7*(s-2)) = 0
1*7-1*(s-2) = 0
9-s = 0
(9-s)/(7*(s-2)) = 0
(9-s)/(7*(s-2)) = 0 // * 7*(s-2)
9-s = 0
9-s = 0 // - 9
-s = -9 // * -1
s = 9
s = 9
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