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r in (-oo:+oo)
(3/5)*r = r^9 // - r^9
(3/5)*r-r^9 = 0
3/5*r-r^9 = 0
r*(3/5-r^8) = 0
-1*r^8 = -3/5 // : -1
r^8 = 3/5
r^8 = 3/5 // ^ 1/8
abs(r) = (3/5)^(1/8)
r = (3/5)^(1/8) or r = -(3/5)^(1/8)
r = 0
r = 0
r in { (3/5)^(1/8), -(3/5)^(1/8), 0 }
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