7*8/4*15=840/4=210
6*15/30*18=15/5*18=3*18=54
8*9/27*6=432/27=16
35*42/30*49=35*21/15*49=7*21/3*49=7*7*49=2401
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7*8/4*15=840/4=210
6*15/30*18=15/5*18=3*18=54
8*9/27*6=432/27=16
35*42/30*49=35*21/15*49=7*21/3*49=7*7*49=2401