Ответ:
Х-2/3=5/6х
Х-5/6х=2/3
6/6х-5/6х=2/3
1/6х=2/3:1/6
Х=4
2/3у-1/3=5/9у
2/3у-5/9у=1/3
6/9у-5/9у=1/3
1/9у=1/3
у=1/3
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Ответ:
Х-2/3=5/6х
Х-5/6х=2/3
6/6х-5/6х=2/3
1/6х=2/3:1/6
Х=4
2/3у-1/3=5/9у
2/3у-5/9у=1/3
6/9у-5/9у=1/3
1/9у=1/3
у=1/3