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5x-y=6
3x+2y=1
-y=6-5 x /*(-1)
3x+2y=1
y=5x-6
3x+2(5x-6)=1
3x+10x-12=1
13x=1+12
x=13/13
x=1
3+2y=1
2y=1-3
y=-2/2
y=-1
x=1 y=-1