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x in (-oo:+oo)
(f/5)*x^20 = 16 // - 16
(f/5)*x^20-16 = 0
1/5*f*x^20 = 16 // : 1/5*f
x^20 = 80*f^-1
x^20 = 80*f^-1 // ^ 1/20
abs(x) = 80^(1/20)*f^(-1/20)
x = 80^(1/20)*f^(-1/20) or x = -(80^(1/20)*f^(-1/20))
x in { 80^(1/20)*f^(-1/20), -(80^(1/20)*f^(-1/20)) }
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