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x in (-oo:+oo)
(1/2)*x^4-8 = 0
1/2*x^4 = 8 // : 1/2
x^4 = 16
x^4 = 16 // ^ 1/4
abs(x) = 2
x = 2 or x = -2
x in { 2, -2 }
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