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Mam nadzieję, że pomogłam ;)
(12 10/18 - 10 15/18) + (2 14/24 + 3 15/24) =
(11 28/18 - 10 15/18) + 5 29/24 =
1 13/18 + 6 5/24 = 1 52/72 + 6 15/72 = 7 67/72