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x - y + 1 = 0, x + y + 1 = 0
x - y + 1 = 0, x + y + 7 = 0
2x + 3y = 0, 3x + 2y = 0
2x - y + 2 = 0, 4x + 3y + 1 = 0
3x -4y = 1, x + 2y = 7
ANS : 1
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