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x+2y=4
2x+y= -1
x= 4-2y
2(4-2y) +y= -1
x= 4-2y
8-4y+y= -1
x= 4-2y
8 -3y = -1
x= 4-2y
-3y = -9
x= 4-2y
y=3
x= 4 - 2*3
y=3
x= -2