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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
(4*m-6)/m = 0
4*m-6 = 0 // + 6
4*m = 6 // : 4
m = 6/4
m = 3/2
m = 3/2
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