Ответ:
(8целых 11/14-y)+2/7=59/14
8 11/14 - у=59/14-2/7
8 11/14 - у =55/14
у=8 11/14-55/14=123/14-55/14 = 68/14 = 34/7 = 4 6/7
у = 4 6/7