Ответ:
6_7/9-х=4_2/9
61/9-х=38/9
-х=38/9-61/9
-х=-23/9
х = 23/9
у+2_6/7=5_3/7
у+20/7=38/7
у=38/7-20/7
у=18/7=2_4/7.
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Ответ:
6_7/9-х=4_2/9
61/9-х=38/9
-х=38/9-61/9
-х=-23/9
х = 23/9
у+2_6/7=5_3/7
у+20/7=38/7
у=38/7-20/7
у=18/7=2_4/7.