x^3 + x^2 + x - x^2 - x - 1 = x + x^3
x^3 + x^2 + x - x^2 - x - 1 - x - x^3 = 0
x = -1
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x^3 + x^2 + x - x^2 - x - 1 = x + x^3
x^3 + x^2 + x - x^2 - x - 1 - x - x^3 = 0
x = -1