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