-x^2 - 2 x z + x - z^2
1\/4 (1 - 4 z) - 1\/4 (2 x + 2 z - 1)^2
x (-x - 2 z + 1) - z^2
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-x^2 - 2 x z + x - z^2
1\/4 (1 - 4 z) - 1\/4 (2 x + 2 z - 1)^2
x (-x - 2 z + 1) - z^2