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v in (-oo:+oo)
(1/2)^3*v = (1/8)*v // - (1/8)*v
(1/2)^3*v-((1/8)*v) = 0
(1/2)^3*v+(-1/8)*v = 0
0 = 0
v należy do R
v in (-oo:+oo)
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