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D( m )
(m-2)*(m-4) = 0
(m-2)*(m-4) = 0
(m-2)*(m-4) = 0
( m-2 )
m-2 = 0 // + 2
m = 2
( m-4 )
m-4 = 0 // + 4
m = 4
m in (-oo:2) U (2:4) U (4:+oo)
0 = -2/((m-2)*(m-4)) // + -2/((m-2)*(m-4))
0-(-2/((m-2)*(m-4))) = 0
2*(m-2)^-1*(m-4)^-1 = 0
2/((m-2)*(m-4)) = 0
2 = 0
m belongs to the empty set
m belongs to the empty set
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