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b in (-oo:+oo)
2/5 = b^16 // - b^16
2/5-b^16 = 0
-1*b^16 = -2/5 // : -1
b^16 = 2/5
b^16 = 2/5 // ^ 1/16
abs(b) = (2/5)^(1/16)
b = (2/5)^(1/16) or b = -(2/5)^(1/16)
b in { (2/5)^(1/16), -(2/5)^(1/16) }
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