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