5(x+y)-2x=0 3x-10(x+y)=2
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![5(x+y)-2x=0 3x-10(x+y)=2](/uploads/image/z/1629731-11-1.jpg?t=5%28x%2By%29-2x%3D0+3x-10%28x%2By%29%3D2)
5(x+y)-2x=0 3x-10(x+y)=2
5(x+y)-2x=0 3x-10(x+y)=2
5(x+y)-2x=0 3x-10(x+y)=2
5(x+y)-2x=0 3x+5y=0 6x+10y=0 ①
3x-10(x+y)=2 7x+10y=-2 ②
②-① x=-2
代入① y=6/5
2x=2推出x=1,然后代入15(1+y)-10(1+y)=2推出y= -- 3/5