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D( j )
2*j = 0
2*j = 0
2*j = 0
2*j = 0 // : 2
j = 0
j in (-oo:0) U (0:+oo)
1/(2*j) = 0
1/2*j^-1 = 0 // : 1/2
j^-1 = 0
j należy do O
j belongs to the empty set
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