2375+425+815+891
23/75 + 4/25 + 8/15 + 8/91 = 1 8/91
1) 23/75 + 4/25 = 23/75 + 12/75 = 35/75 = 7/15
2) 7/15 + 8/15 = 15/15 = 1
3) 1 + 8/91 = 1 8/91
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23/75 + 4/25 + 8/15 + 8/91 = 1 8/91
1) 23/75 + 4/25 = 23/75 + 12/75 = 35/75 = 7/15
2) 7/15 + 8/15 = 15/15 = 1
3) 1 + 8/91 = 1 8/91