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x in (-oo:+oo)
8-((8*x^20)/20) = 0
(-2/5)*x^20+8 = 0
-2/5*x^20 = -8 // : -2/5
x^20 = 20
x^20 = 20 // ^ 1/20
abs(x) = 20^(1/20)
x = 20^(1/20) or x = -20^(1/20)
x in { 20^(1/20), -20^(1/20) }
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