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D( m )
4*m-3 = 0
4*m-3 = 0
4*m-3 = 0
4*m-3 = 0 // + 3
4*m = 3 // : 4
m = 3/4
m in (-oo:3/4) U (3/4:+oo)
(2*m-2)/(4*m-3) = 0
2*m-2 = 0 // + 2
2*m = 2 // : 2
m = 2/2
m = 1
m = 1
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