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4 8/9+2 7/10=6 80/90+63/90=6 143/90=7 53/90
2 7/9+3 1/6=5 42/54+9/54=5 51/54
3 7/15+2 9/10=3 14/30+27/30=3 41/30=3 11/30
4 5/6-1 1/2=3 5/6-3/6=3 2/6=3 1/3
8 1/6-2 4/5=6 5/30-24/30=185/30-24/30=161/30=5 11/30
3 1/4-1 1/6=2 3/12-2/12=2 1/12
8 3/4-1 7/10=7 15/20-14/20=7 1/20