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b in (-oo:+oo)
8/13 = b^65 // - b^65
8/13-b^65 = 0
-1*b^65 = -8/13 // : -1
b^65 = 8/13
b^65 = 8/13 // ^ 1/65
b = (8/13)^(1/65)
b = (8/13)^(1/65)
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