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Anonymous
X + 1 - x - 1 = 0, for all x. Regroup: (x - x) + (1 - 1) = 0 + 0.
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x
(x - 1)(x - 1)(x - 1) - (x + 1)(x + 1)(x + 1)
(x + 3)(x - 1)(x + 1)