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