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(12/13)*x+3/26 = 81/78 // - 81/78
(12/13)*x+3/26-(81/78) = 0
(12/13)*x+3/26-27/26 = 0
12/13*x-12/13 = 0 // + 12/13
12/13*x = 12/13 // : 12/13
x = 12/13/12/13
x = 1
x = 1
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