-1 + 1/3 (27/2 - (3 sqrt(69))/2)^(1/3) + (1/2 (9 + sqrt(69)))^(1/3)/3^(2/3) + (-1 + 1/3 (27/2 - (3 sqrt(69))/2)^(1/3) + (1/2 (9 + sqrt(69)))^(1/3)/3^(2/3))^2

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