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Step-by-step explanation:
x³ + 1/x³ = 110
(x + 1/x)³ - 3(x + 1/x) = 110
x + 1/x = k let
k³ - 3k - 110 = 0
k(k² - 3) = 110
k(k² - 3) = 5(5² - 3)
so k = 5 ANSWER
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