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(4/13)*x+3/13 = 66/26 // - 66/26
(4/13)*x+3/13-(66/26) = 0
(4/13)*x+3/13-33/13 = 0
4/13*x-30/13 = 0 // + 30/13
4/13*x = 30/13 // : 4/13
x = 30/13/4/13
x = 15/2
x = 15/2
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