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x-2y=8
4x+2y=2
x-2y=8
------------- +
5x=10
x=2
2*2+y=1
y=1-4
y=-3
x-3y=9
3x+y=7 /*3
x-3y=9
9x+3y=21
------------- +
10x=30
x=3
3*3+y=7
y=7-9
y=-2