-1+5/7=-7/7+5/7=-2/7
-2+3/4=-8/4+3/4=-5/4=-1 1/4
3-1/7=21/7-1/7=20/7=2 6/7
1-2/3=3/3-2/3=1/3
-2-1/7=-14/7-1/7=-15/7=-2 1/7
-5-2 3/7 =-7 3/7
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-1+5/7=-7/7+5/7=-2/7
-2+3/4=-8/4+3/4=-5/4=-1 1/4
3-1/7=21/7-1/7=20/7=2 6/7
1-2/3=3/3-2/3=1/3
-2-1/7=-14/7-1/7=-15/7=-2 1/7
-5-2 3/7 =-7 3/7