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x+y=5 /* 2
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2
2(x+y)=3x -y
x+y =10
2x + 2y = 3x - y
x +y=10
2x-3x+2y+y=0
x+y=10
-x+3y=0
4y=10/4
y= 2 1/2
x+y=10
x+ 2 1/2 =10
x=10- 2 1/2
x= 7 1/2