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((-x³-3b²x)/(x³-b³) + x/(x-b))(b/x - 1)((2b-1)/(4b+x) - 1/2)
((-x³-3b²x)/(x³-b³) + x/(x-b))(b/x - 1)((2b-1)/(4b+x) - 1/2)
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