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