1) (7/15 - 1/6) +2/5
2) (3/8 - 1/9) + 25/36
3) (8/9 - 5/6) +2/3
4) (7/8 - 13/20) +9/10
5) (7/18 - 1/12) + 5/6
6) (3/4 - 8/15) + 17/20
2) (3/8 - 1/9) + 25/36
3) (8/9 - 5/6) +2/3
4) (7/8 - 13/20) +9/10
5) (7/18 - 1/12) + 5/6
6) (3/4 - 8/15) + 17/20
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