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x in (-oo:+oo)
(4/16)*x^4-32 = 0
1/4*x^4 = 32 // : 1/4
x^4 = 128
x^4 = 128 // ^ 1/4
abs(x) = 2*8^(1/4)
x = 2*8^(1/4) or x = -(2*8^(1/4))
x in { 2*8^(1/4), -(2*8^(1/4)) }
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