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x-2y=6
x=3-y
3-y-2y=6
x=3-y
-3y=6-3
x=3-y
-3y=3/:(-3)
x=3-y
y=-1
x=3+1
y=-1
x=4
y=-1
(x-2y=6
(x=3-y
(3-y-2y=6
(x=3-y
(3-3y=6/(-3)
(x=3-y
(y=2
(x=3-2
(y=2
(x=1
(y=2
x-2y=6
x=3-y
3-y-2y=6-y
x=3-y
-3y+y=6-3
x=3-y
-2y=3
x=3+1,5
y=-1,5
x=4,5
y=-1,5