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y in (-oo:+oo)
(2/5)*y^8 = 20 // - 20
(2/5)*y^8-20 = 0
2/5*y^8 = 20 // : 2/5
y^8 = 50
y^8 = 50 // ^ 1/8
abs(y) = 50^(1/8)
y = 50^(1/8) or y = -50^(1/8)
y in { 50^(1/8), -50^(1/8) }
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