-1/5+1/20=4/20+1/20=5/20=1/4
5/6-7/10=25/30-21/30=24/30=4/5
1/8+11/36=9/72+22/72=31/72
7/8-5/8=2/8=1/4
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-1/5+1/20=4/20+1/20=5/20=1/4
5/6-7/10=25/30-21/30=24/30=4/5
1/8+11/36=9/72+22/72=31/72
7/8-5/8=2/8=1/4