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4/5 = x^90 // - x^90
4/5-x^90 = 0
-1*x^90 = -4/5 // : -1
x^90 = 4/5
x^90 = 4/5 // ^ 1/90
abs(x) = (4/5)^(1/90)
x = (4/5)^(1/90) or x = -(4/5)^(1/90)
x in { (4/5)^(1/90), -(4/5)^(1/90) }
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