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(36/121)*x^4-81 = 0
36/121*x^4 = 81 // : 36/121
x^4 = 1089/4
x^4 = 1089/4 // ^ 1/4
abs(x) = (1089/4)^(1/4)
x = (1089/4)^(1/4) or x = -(1089/4)^(1/4)
x in { (1089/4)^(1/4), -(1089/4)^(1/4) }
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