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x+y=3
--------- +
4x=12 /:4
x=3
x+y=3
3+y=3
y=3-3
y=0
x=3
y=0
x+y=3
x=3-y
3(3-y)-y=9
9-4y=9
y=0
x=3
y=3 - x
3x - 3 +x =9
y= 3-x
4x=12
y=3 - x
x=3
y=0