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x in (-oo:+oo)
(x/5)^6 = 90 // - 90
(x/5)^6-90 = 0
1/15625*x^6 = 90 // : 1/15625
x^6 = 1406250
x^6 = 1406250 // ^ 1/6
abs(x) = 5*90^(1/6)
x = 5*90^(1/6) or x = -(5*90^(1/6))
x in { 5*90^(1/6), -(5*90^(1/6)) }
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