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D( d )
d = 0
d^-4 = 0
d = 0
d = 0
d^-4 = 0
d^-4 = 0
1*d^-4 = 0 // : 1
d^-4 = 0
d naleu017Cy do O
d in (-oo:0) U (0:+oo)
(d^7)/(d^-4) = 0
1*d^11 = 0 // : 1
d^11 = 0
d = 0
d in { 0}
d belongs to the empty set
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