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