2 1/4*7/9+2\9*2 1/4=
5 5/6*1 5/7+1 1/6*3/7=
5/6*1 7/11*4,4=
7 6/7*1 6/11+3 1/7*3/11=
3/8*2 2/7*4 2/3=
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