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20*x^6-(12/3) = 0
20*x^6-4 = 0
20*x^6 = 4 // : 20
x^6 = 1/5
x^6 = 1/5 // ^ 1/6
abs(x) = (1/5)^(1/6)
x = (1/5)^(1/6) or x = -(1/5)^(1/6)
x in { (1/5)^(1/6), -(1/5)^(1/6) }
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