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