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b in (-oo:+oo)
1/5 = b^15 // - b^15
1/5-b^15 = 0
-1*b^15 = -1/5 // : -1
b^15 = 1/5
b^15 = 1/5 // ^ 1/15
b = (1/5)^(1/15)
b = (1/5)^(1/15)
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