5 2/13 - (x-5/13) = 1 4/13
5 2/13 - x + 5/13 = 1 4/13
5 7/13 - х = 1 4/13
х = 5 7/13 - 1 4/13
х = 4 3/13
5 2/13 - (x-5/13) = 1 4/13
5 2/13 - x + 5/13 = 1 4/13
5 7/13 - х = 1 4/13
х = 5 7/13 - 1 4/13
х = 4 3/13