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{ 3 = 2IxI + y
3=x+y
3=2x+y
y=3-x
3=2x+3-x
0=x
y=3
3=-x-y
3=-2x+y
6=-3x
x=-1
y=3+2x
y=3-2
y=1
3= 2x + y
-3= -x -y
3= 2x+y
___________
x=0
y= 3