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x in (-oo:+oo)
(x+5)/14 = (x-8)/3+5/7 // - (x-8)/3+5/7
(x+5)/14-((x-8)/3)-(5/7) = 0
(x+5)/14-((x-8)/3)-5/7 = 0
(x+5)/14+(-1*(x-8))/3-5/7 = 0
(3*7*(x+5))/(3*7*14)+(-1*7*14*(x-8))/(3*7*14)+(-5*3*14)/(3*7*14) = 0
3*7*(x+5)-1*7*14*(x-8)-5*3*14 = 0
889-77*x-210 = 0
679-77*x = 0
(679-77*x)/(3*7*14) = 0
(679-77*x)/(3*7*14) = 0 // * 3*7*14
679-77*x = 0
679-77*x = 0 // - 679
-77*x = -679 // : -77
x = -679/(-77)
x = 97/11
x = 97/11
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