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(5*x)/13 = 4/20 // - 4/20
(5*x)/13-(4/20) = 0
(5*x)/13-1/5 = 0
5/13*x-1/5 = 0 // + 1/5
5/13*x = 1/5 // : 5/13
x = 1/5/5/13
x = 13/25
x = 13/25
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