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(4*x)/7-(x/2) = 13/14 // - 13/14
(4*x)/7-(x/2)-(13/14) = 0
(4*x)/7-(x/2)-13/14 = 0
1/14*x-13/14 = 0 // + 13/14
1/14*x = 13/14 // : 1/14
x = 13/14/1/14
x = 13
x = 13
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