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D( v )
(9*v)^7 = 0
(9*v)^7 = 0
(9*v)^7 = 0
4782969*v^7 = 0 // : 4782969
v^7 = 0
v = 0
v in (-oo:0) U (0:+oo)
((9*v)^4)/((9*v)^7) = 0
1/729*v^-3 = 0 // : 1/729
v^-3 = 0
v należy do O
v belongs to the empty set
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