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5 5/7 - 2 1/5 = 5 i 25/35 - 2 i 7/35 = 3 i 18/35
6 2/9 - 4 3/7 = 6 i 14/63 - 4 i 27/63 = 5 i 77/63 - 4 i 27/63 = 1 i 50/63
11/14 * 7/9 = 77/126
5/7 * 10/21 = 50/147
2 3/5 * 7 1/2 = 13/5 * 15/2 = 39/2 = 19 i 1/2