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r in (-oo:+oo)
(7*r)/8+5*r-(10/3) = 0
(7*r)/8+5*r-10/3 = 0
47/8*r-10/3 = 0 // + 10/3
47/8*r = 10/3 // : 47/8
r = 10/3/47/8
r = 80/141
r = 80/141
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