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x in (-oo:+oo)
x^4 = 1/10 // - 1/10
x^4-(1/10) = 0
x^4-1/10 = 0
1*x^4 = 1/10 // : 1
x^4 = 1/10
x^4 = 1/10 // ^ 1/4
abs(x) = (1/10)^(1/4)
x = (1/10)^(1/4) or x = -(1/10)^(1/4)
x in { (1/10)^(1/4), -(1/10)^(1/4) }
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