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x in (-oo:+oo)
(1/2)*x^4 = 48 // - 48
(1/2)*x^4-48 = 0
1/2*x^4 = 48 // : 1/2
x^4 = 96
x^4 = 96 // ^ 1/4
abs(x) = 2*6^(1/4)
x = 2*6^(1/4) or x = -(2*6^(1/4))
x in { 2*6^(1/4), -(2*6^(1/4)) }
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