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