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x in (-oo:+oo)
16 = (x^4)/5 // - (x^4)/5
16-((x^4)/5) = 0
-1/5*x^4 = -16 // : -1/5
x^4 = 80
x^4 = 80 // ^ 1/4
abs(x) = 2*5^(1/4)
x = 2*5^(1/4) or x = -(2*5^(1/4))
x in { 2*5^(1/4), -(2*5^(1/4)) }
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