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v in (-oo:+oo)
5/8 = v^6 // - v^6
5/8-v^6 = 0
-1*v^6 = -5/8 // : -1
v^6 = 5/8
v^6 = 5/8 // ^ 1/6
abs(v) = (5/8)^(1/6)
v = (5/8)^(1/6) or v = -(5/8)^(1/6)
v in { (5/8)^(1/6), -(5/8)^(1/6) }
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