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D( X )
X-1 = 0
X-2 = 0
X-1 = 0
X-1 = 0
X-1 = 0 // + 1
X = 1
X-2 = 0
X-2 = 0
X-2 = 0 // + 2
X = 2
X in (-oo:1) U (1:2) U (2:+oo)
2/(X-1) = 1/(X-2) // - 1/(X-2)
2/(X-1)-(1/(X-2)) = 0
2/(X-1)-(X-2)^-1 = 0
2/(X-1)-1/(X-2) = 0
(2*(X-2))/((X-1)*(X-2))+(-1*(X-1))/((X-1)*(X-2)) = 0
2*(X-2)-1*(X-1) = 0
X-3 = 0
(X-3)/((X-1)*(X-2)) = 0
(X-3)/((X-1)*(X-2)) = 0 // * (X-1)*(X-2)
X-3 = 0
X-3 = 0 // + 3
X = 3
X = 3
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