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(2*x^3-(2/7))^3 = 0
(2*x^3-2/7)^3 = 0
2*x^3 = 2/7 // : 2
x^3 = 1/7
x^3 = 1/7 // ^ 1/3
x = (1/7)^(1/3)
x in { (1/7)^(1/3), (1/7)^(1/3), (1/7)^(1/3) }
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