7 3/8-n+4 7/15+n-7 3/8-2 4/5= 4 7/15-2 4/5=
4 7/15-2 12/15=3 15/15+7/15-2 12/15=3 22/15-2 12/15=
1 10/15=1 2/3
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7 3/8-n+4 7/15+n-7 3/8-2 4/5= 4 7/15-2 4/5=
4 7/15-2 12/15=3 15/15+7/15-2 12/15=3 22/15-2 12/15=
1 10/15=1 2/3