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