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x=5-y
2y+2=2(5-y)
2y+2=10-2y
4y=8
y=2
x=5-y
=5-2
=3
b). -y=2x-6 x+y=1
y=1-x
-y=2x-6
(1-x)=6-2x
x=5
y=1-x
=1-5
=-4