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4*x^6-(21/3) = 0
4*x^6-7 = 0
4*x^6 = 7 // : 4
x^6 = 7/4
x^6 = 7/4 // ^ 1/6
abs(x) = (7/4)^(1/6)
x = (7/4)^(1/6) or x = -(7/4)^(1/6)
x in { (7/4)^(1/6), -(7/4)^(1/6) }
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