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