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x in (-oo:+oo)
(X/7)*x^6 = 3 // - 3
(X/7)*x^6-3 = 0
1/7*X*x^6 = 3 // : 1/7*X
x^6 = 21*X^-1
x^6 = 21*X^-1 // ^ 1/6
abs(x) = 21^(1/6)*X^(-1/6)
x = 21^(1/6)*X^(-1/6) or x = -(21^(1/6)*X^(-1/6))
x in { 21^(1/6)*X^(-1/6), -(21^(1/6)*X^(-1/6)) }
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