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(7*x^6)/3-1 = 0
7/3*x^6 = 1 // : 7/3
x^6 = 3/7
x^6 = 3/7 // ^ 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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