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x = 7 - 4√3 x + 1/x = 7 - 4√3 + 1/(7-4√3) x + 1/x = 7 - 4√3 + 7 + 4√3 x + 1/x = 14 So x³ + 1/x³ = (14)³ - 3 × 14 = 2744 - 42 = 2702 (x + 1/x = a, x³ + 1/x³ = a³ - 3a)
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