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2)=10/14-1/14=9/14
3)2/5+7/4=8/20+35/20=43/20
4)16/7-45/21+3/21=48/21-45/21+3/21=3/21+3/21=6/21=2/7
5)58/9+5/10-3/9=580/90+45/90-30/90=595/90=119/18