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12-(2 1/5+3 3/4)=12-(11/5+15/4)=12-(44/20+75/20)=12-119/20=720/60-357/60=
363/60=6 3/60=6 1/20
1 3/4+4/7+3 5/7+2 1/4=7/4+4/7+26/7+9/4=30/7+16/4=120/28+112/28=232/28=
=8 8/28=8 2/7