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7⋅15⋅26/35⋅49⋅13  8⋅81⋅31/31⋅63⋅32

(7*15*26) / (35*49*13)=(7*5*3*2*13) / (7*5*7*7*13)=6/49(8*81*31) / (31*63*32)=(8*9*9*31) / (31*7*9*4*8)=9/28