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r in (-oo:+oo)
8-(r/7) = (7*r+14)/8 // - (7*r+14)/8
8-((7*r+14)/8)-(r/7) = 0
(-1*(7*r+14))/8-r/7+8 = 0
(-1*7*(7*r+14))/(7*8)+(8*(-r))/(7*8)+(7*8^2)/(7*8) = 0
8*(-r)-1*7*(7*r+14)+7*8^2 = 0
448-57*r-98 = 0
350-57*r = 0
(350-57*r)/(7*8) = 0
(350-57*r)/(7*8) = 0 // * 7*8
350-57*r = 0
350-57*r = 0 // - 350
-57*r = -350 // : -57
r = -350/(-57)
r = 350/57
r = 350/57
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