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r in (-oo:+oo)
(7*r)/8+(7*r)/12 = 5*r-(10/3) // - 5*r-(10/3)
(7*r)/8+(7*r)/12-(5*r)+10/3 = 0
(7*r)/8+(7*r)/12-5*r+10/3 = 0
10/3-85/24*r = 0 // - 10/3
-85/24*r = -10/3 // : -85/24
r = -10/3/(-85/24)
r = 16/17
r = 16/17
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