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D( m )
m = 0
2*m = 0
m = 0
m = 0
2*m = 0
2*m = 0
2*m = 0 // : 2
m = 0
m in (-oo:0) U (0:+oo)
6/(2*m)+3/m = 0
6*m^-1 = 0 // : 6
m^-1 = 0
m naleu017Cy do O
m belongs to the empty set
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