7/648+11/972
19/3960+23/132
7/3250+1/1300-3/5000
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7/648+11/972 = (7*3+11*2)/1944 = 43/1944
19/3960+23/132 = (19+23*30)/3960 = 709/3960
7/3250+1/1300-3/5000 = (7*20+1*50-3*13)/65000 = (140+50-39)/65000 = 151/65000