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D( m )
-3*m = 0
-3*m = 0
-3*m = 0
-3*m = 0 // : -3
m = 0
m in (-oo:0) U (0:+oo)
(-4*m)/(-3*m) = 0
4/3 = 0
m belongs to the empty set
m belongs to the empty set
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