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r in (-oo:+oo)
((8-(5*r))^5)/16 = 0
((8-5*r)^5)/16 = 0
8-5*r = 0 // - 8
-5*r = -8 // : -5
r = -8/(-5)
r = 8/5
r in { 8/5, 8/5, 8/5, 8/5, 8/5 }
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