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X in (-oo:+oo)
((X^6)^1)/6 = (729^1)/6 // - (729^1)/6
((X^6)^1)/6-((729^1)/6) = 0
(X^6)/6-243/2 = 0
1/6*X^6 = 243/2 // : 1/6
X^6 = 729
X^6 = 729 // ^ 1/6
abs(X) = 3
X = 3 or X = -3
X in { 3, -3 }
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