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2x+6y=-8
x+y=2/*(-2)
2x+6y=-8
-2x-2y=-4
2x+6y=-8
-----------------
4y=-12/:4
y=-3
y=1
x+y=2 bo 1+=2
2x+6x=8 bo 2×1+6×1-8
y=-1/3x-1 2/6