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x in (-oo:+oo)
x^4 = 3/2 // - 3/2
x^4-(3/2) = 0
x^4-3/2 = 0
1*x^4 = 3/2 // : 1
x^4 = 3/2
x^4 = 3/2 // ^ 1/4
abs(x) = (3/2)^(1/4)
x = (3/2)^(1/4) or x = -(3/2)^(1/4)
x in { (3/2)^(1/4), -(3/2)^(1/4) }
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