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7\3-20\12=
40\100-1\20=
11\7-55\77=
28\32-15\40=
14\49-5\35=
18\20-9\30=
1\3+1\4+1\5+2\3+2\4+4\5=
5\2+7\3+11\6-3\2-4\3-5\6=


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