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a
14/21+12/21=26/21=1 5/21
15/18+14/18=29/18=1 11/18
25/40+12/40=37/40
b
11/4+1/6= 33/12+2/12=2 9/12
36/9+27/10= 360/90+243/90= 603/90=6 7/90
25/9+19/6= 50/18+57/18=107/18= 5 17/18
52/15+29/10=104/30+57/30=161/30=5 11/30
3/6+2/6=5/6