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r in (-oo:+oo)
3/8 = r^10 // - r^10
3/8-r^10 = 0
-1*r^10 = -3/8 // : -1
r^10 = 3/8
r^10 = 3/8 // ^ 1/10
abs(r) = (3/8)^(1/10)
r = (3/8)^(1/10) or r = -(3/8)^(1/10)
r in { (3/8)^(1/10), -(3/8)^(1/10) }
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