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x in (-oo:+oo)
(1/4)*x^6-16 = 0
1/4*x^6 = 16 // : 1/4
x^6 = 64
x^6 = 64 // ^ 1/6
abs(x) = 2
x = 2 or x = -2
x in { 2, -2 }
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