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12 13/45 - ( у - 5 17/45) = 3 23/45
12 13/45 - ( у - 5 17/45) = 3 23/45
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12 13/45-у+5 17/45=3 23/4517 30/45-у=3 23/45
у= 17 30/45 - 3 23/45
у=14 7/45