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Ответ

Автор - frich1
13 2/9-(7 5/9+у)=3 5/9   
13 2/9-7 5/9-у=3 5/9       ( 13 2/9=12 11/9    12 11/9 - 7 5/9= 5 6/9)
5 6/9 - у= 3 5/9
у = 5 6/9 - 3 5/9
у = 2 1/9



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