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2x+y=-4
-2x+10y=4
2x+y=-4
11y=0
y=0
x=5y-2
x=-2
x-3y=0 /*-1
x+y=-4
-x+3y=0
x+y=-4
4y=-4
y=-1
x=3y
x=-3
2x+y=-4
-2x+10y=4
2x+y=-4
11y=0
y= 0
x-5x0=-2
x=-2
x=-2
y=0
x-3y=0 / x(-1)
x+y=-4
-x+3y=0
x+y=-4
4y=-4 /:4
y=4
x-3x4=0
x=12
x=12
y=4