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r in (-oo:+oo)
(r^6)/5 = 64 // - 64
(r^6)/5-64 = 0
1/5*r^6 = 64 // : 1/5
r^6 = 320
r^6 = 320 // ^ 1/6
abs(r) = 2*5^(1/6)
r = 2*5^(1/6) or r = -(2*5^(1/6))
r in { 2*5^(1/6), -(2*5^(1/6)) }
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