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(7*x)/8-((5*x)/7) = (13*x)/14-13 // - (13*x)/14-13
(7*x)/8-((5*x)/7)-((13*x)/14)+13 = 0
(7*x)/8+(-5/7)*x+(-13/14)*x+13 = 0
13-43/56*x = 0 // - 13
-43/56*x = -13 // : -43/56
x = -13/(-43/56)
x = 728/43
x = 728/43
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