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(2*x)/7-(x/2)+4+5 = 13/14 // - 13/14
(2*x)/7-(x/2)-(13/14)+4+5 = 0
(2*x)/7-(x/2)-13/14+4+5 = 0
113/14-3/14*x = 0 // - 113/14
-3/14*x = -113/14 // : -3/14
x = -113/14/(-3/14)
x = 113/3
x = 113/3
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