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r in (-oo:+oo)
8-((3*r^5)/16) = 0
(-3/16)*r^5+8 = 0
-3/16*r^5 = -8 // : -3/16
r^5 = 128/3
r^5 = 128/3 // ^ 1/5
r = (128/3)^(1/5)
r = (128/3)^(1/5)
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