Решите систему уравнений:{5x-y=7.{3x+2y= -1
{5x-y=7 {y=5x-7 {y=5x-7 {y=5x-7 y=-2 {3x+2y=-1 {3x+10x-14=-1 {13x=13 {x=1 x=1
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