35/68 - (1/68 + 7/22) = 35/68 - (1/68 + 14/44) = 35/68 - (1/68 + 7/44) = 35/68 - 15/44 = (3522 - 6815) / (68*22) = (770 - 1020) / 1496 = -250 / 1496 = -125 / 748
14/39 - (1/12 + 1/39) = 14/39 - (3/36 + 1/39) = 14/39 - (3/36 + 2/78) = 14/39 - 13/78 = (1478 - 3913) / (39*78) = (1092 - 507) / 3042 = 585 / 3042 = 65 / 338.
35/68 - (1/68 + 7/22) = 35/68 - (1/68 + 14/44) = 35/68 - (1/68 + 7/44) = 35/68 - 15/44 = (3522 - 6815) / (68*22) = (770 - 1020) / 1496 = -250 / 1496 = -125 / 748
14/39 - (1/12 + 1/39) = 14/39 - (3/36 + 1/39) = 14/39 - (3/36 + 2/78) = 14/39 - 13/78 = (1478 - 3913) / (39*78) = (1092 - 507) / 3042 = 585 / 3042 = 65 / 338.