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3x=y-6
2x-y=5
3x-y=-6/(-1)
2x-y=5
-3x+y=6
-x=11
x=-11
-22-y=5
-y=27
y=-27
b)y-2x=6
y=3+x
3+x-2x=6
y=3+x
-x=3
y=3+x
x=-3
y=3-3
x=-3
y=0