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x in (-oo:+oo)
(40/2)*x^4-8+2 = 0
20*x^4 = 6 // : 20
x^4 = 3/10
x^4 = 3/10 // ^ 1/4
abs(x) = (3/10)^(1/4)
x = (3/10)^(1/4) or x = -(3/10)^(1/4)
x in { (3/10)^(1/4), -(3/10)^(1/4) }
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