Ответ:
1.x1=3; x2=-3
2.
3.x1= -3/7 ; x2=1
4.x1=-2; x2=2
5.
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Ответ:
1.x1=3; x2=-3
2.
3.x1= -3/7 ; x2=1
4.x1=-2; x2=2
5.