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1/2 + 2/4 = 2/4 + 2/4 = 4/4 = 1
3/4 + 12/16 = 12/16 + 12/16 = 24/32 = 3/4
3/4 - 5/8 = 6/8 - 5/8 = 1/8
4/15 + 2/5 = 4/15 + 6/15 = 10/15 = 2/3
2/3 - 3/5 = 10/15 - 9/15 = 1/15
3/7 - 3/8 = 24/56 - 21/56 = 3/56
3/4 + 12/16 = 12/16 + 12/16 = 24/32 = 3/4
3/4 - 5/8 = 6/8 - 5/8 = 1/8
4/15 + 2/5 = 4/15 + 6/15 = 10/15 = 2/3
2/3 - 3/5 = 10/15 - 9/15 = 1/15
3/7 - 3/8 = 24/56 - 21/56 = 3/56
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