Ответ: (8 11/14-у)+2/7= 5 9/14
8 11/14-у=5 9/14-2/7 \*2
8 11/14-у=5 1/14
у=8 11/14-5 1/14
у=3 10/14=3 5/7
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Ответ: (8 11/14-у)+2/7= 5 9/14
8 11/14-у=5 9/14-2/7 \*2
8 11/14-у=5 1/14
у=8 11/14-5 1/14
у=3 10/14=3 5/7