Ответ:
4/15-у-3/25=1/25
-у=1/25+3/25-4/15
у= -17/75
4/15-1/25=20/75-3/75=17/75
17/75-9/75=8/75
У=8/75
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Ответ:
4/15-у-3/25=1/25
-у=1/25+3/25-4/15
у= -17/75
4/15-1/25=20/75-3/75=17/75
17/75-9/75=8/75
У=8/75