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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)
(5/(s-2))*(s-3)*(s-6) = 0
(5*(s-3)*(s-6))/(s-2) = 0
( 5 )
5 = 0
s belongs to the empty set
( s-3 )
s-3 = 0 // + 3
s = 3
( s-6 )
s-6 = 0 // + 6
s = 6
s in { 3, 6 }
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