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D( m )
-m = 0
-m = 0
m = 0
m in (-oo:0) U (0:+oo)
((4*m)/(-m))/6 = 7/2 // - 7/2
((4*m)/(-m))/6-(7/2) = 0
((4*m)/(-m))/6-7/2 = 0
-25/6 = 0
m belongs to the empty set
m belongs to the empty set
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