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