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pokazac, ze log5 4 i 20/29 = 3b - 2a /jest chyba blad, powinno byc 49 zamiast 29
latwiej bedzie pokazac od konca, czyli:
3b - 2a = 3*log5 6 - 2*log5 7 = log5(6^3) - log5(7^2) = log5 216 - log5 49 =
log5 (216/49) = log5 (4 i 20/49)