Ответ:
х-у=3-1
х-у=2
2-у= - 3 2+у =1
x-y=3-1
x-y=2
2-y=-32+y=1
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Ответ:
х-у=3-1
х-у=2
2-у= - 3 2+у =1
Ответ:
x-y=3-1
x-y=2
2-y=-32+y=1