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x + y = 3
________ _
- 3y = 6
y = - 2
x = 5
HP: {5,-2}
2x+2y=6
................-
2x-4y=18
2x+2y=6
.............-
-6y=12
y=-2
2x+2y=6
2x+2(-2)=6
2x=10
x=5