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X in (-oo:+oo)
(X^6)/7 = 729 // - 729
(X^6)/7-729 = 0
1/7*X^6 = 729 // : 1/7
X^6 = 5103
X^6 = 5103 // ^ 1/6
abs(X) = 3*7^(1/6)
X = 3*7^(1/6) or X = -(3*7^(1/6))
X in { 3*7^(1/6), -(3*7^(1/6)) }
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