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4 2/7 * 9,8 = 30/7 * 98/10 = 3/1 * 14/1 = 42/1 = 42
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4 2/7 + 9,8 = 4 2/7 + 9 4/5 = 4 10/35 + 9 28/35 = 13 38/35 = 14 3/35
42 - 14 3/35 = 41 35/35 - 14 3/35 = 27 32/35