4 5/13 + 1 6/13-3 8/13=
1) 4 5/13+1 6/13=5 11/13
2)5 11/13-3 8/13=2 3/13
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4 5/13 + 1 6/13-3 8/13=
1) 4 5/13+1 6/13=5 11/13
2)5 11/13-3 8/13=2 3/13