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2[1/7]+ 3/5=2 [5/35]+ 21/35=2 [26/35]
8[3/5] - 6[7/8] = 8[24/40] - 6[35/40] = 7[64/40] - 6[35/40]=1[29/40]
6[1/9]-5[1/7]=6[7/63]-5[9/63]=5[70/63]-5[9/63]=61/63
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