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D( v )
3*v^-8 = 0
v = 0
v^-2 = 0
3*v^-8 = 0
3*v^-8 = 0
3*v^-8 = 0 // : 3
v^-8 = 0
v należy do O
v = 0
v = 0
v^-2 = 0
v^-2 = 0
1*v^-2 = 0 // : 1
v^-2 = 0
v należy do O
v in (-oo:0) U (0:+oo)
(4*v^-5*(v^-2)^-4)/(3*v^-8) = 0
4/3*v^11 = 0 // : 4/3
v^11 = 0
v = 0
v in { 0}
v belongs to the empty set
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