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(7*x)/13 = 21/26 // - 21/26
(7*x)/13-(21/26) = 0
(7*x)/13-21/26 = 0
7/13*x-21/26 = 0 // + 21/26
7/13*x = 21/26 // : 7/13
x = 21/26/7/13
x = 3/2
x = 3/2
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