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Ответ:

2x-5y=-1

3x+2y=8

2x=-1+5y

x=-0.5+2,5y

3(-0.5+2,5y)+2y=8

-1,5+7,5y+2y=8

9,5y=9,5

y=1

x=-0,5+2,5

x=2