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-(2 (1125 b^2 - 3200 b - sqrt(-(5 b - 32)^2 (15 b - 16)^3) + 2048))/3125 where b = 1/4
-(2 (1125 b^2 - 3200 b - sqrt(-(5 b - 32)^2 (15 b - 16)^3) + 2048))/3125 where b = 1/4
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