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D( m )
2*m-4 = 0
2*m-4 = 0
2*m-4 = 0
2*m-4 = 0 // + 4
2*m = 4 // : 2
m = 4/2
m = 2
m in (-oo:2) U (2:+oo)
(m+2)/(2*m-4) = 0
m+2 = 0 // - 2
m = -2
m = -2
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