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2x - 4y = 6
2x - 2y = 4 -
-2y = 2
y = -1
2x - 4y = 6
2x + 4 = 6
2x = 2
x = 1
2x - 2y = 4
------------------ -
- 2y = 2
y = -1
2x - 4y = 6
2x - 4(-1) = 6
2x + 4 = 6
2x = 6 - 4
2x = 2
x = 1
Hp {1,-1}