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2x - 1 = y
(x - y)^2 = 0
(x - (2x-1))^2 = 0
(-x-1)^2 = 0
x^2 + 2x +1 = 0
(x+1) (x+1) = 0
x = -1
2x - y = 1
2(-1) - y = 1
-2 - y = 1
-y = 3
y = -3