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x in (-oo:+oo)
(6/7)*x^6 = 66 // - 66
(6/7)*x^6-66 = 0
6/7*x^6 = 66 // : 6/7
x^6 = 77
x^6 = 77 // ^ 1/6
abs(x) = 77^(1/6)
x = 77^(1/6) or x = -77^(1/6)
x in { 77^(1/6), -77^(1/6) }
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