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(36/9)*x^4-1 = 0
4*x^4 = 1 // : 4
x^4 = 1/4
x^4 = 1/4 // ^ 1/4
abs(x) = (1/4)^(1/4)
x = (1/4)^(1/4) or x = -(1/4)^(1/4)
x in { (1/4)^(1/4), -(1/4)^(1/4) }
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