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D( m )
m = 0
4*m = 0
m = 0
m = 0
4*m = 0
4*m = 0
4*m = 0 // : 4
m = 0
m in (-oo:0) U (0:+oo)
3/m-(5/(4*m)) = 0
3/m+(-5/4)*m^-1 = 0
7/4*m^-1 = 0 // : 7/4
m^-1 = 0
m należy do O
m belongs to the empty set
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