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x-y=-2
3x=2 / :3
x=
2x+y=4
2*+y=4
y=4-
y=3
x=
y=3
b)
2x-y=0
2x+y=12
4x=12 / :4
x=3
2*3-y=0
-y=6
y=-6
x=3