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Ответ

Ответ дан
lakOR555

1)

х=-1+2у

2х+у=3

х=2у-1

2*(2у-1)+у=3

4у-2+у=3

5у=5

у=1

х=2*1-1

х=1

..........................

2)

х=8+у

8+у+у=-3

2у=-3-8

2у=-11

у=-5,5

х=8-5,5

х=2,5

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