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