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x+2y=4
6x-2y=12
x+2y=4
----------------- +
7x=16
x=16/7
16/7 +2y =4
2y =28/7 -16/7
y=12/(7*2)
y=6/7
x+y=16/7 +6/7 =22/7 =3 1/7