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5/16:12/5x8/25=5/16x5/12x8/25=200/4800=1/24
10/21x1/5:16/7=10/105x7/16=5/15x1/8=1/3x1/8=1/24
7/18x15/24x6/35=1/6x1/4x1=1/24
(7-5 2/5)x1/4=(6 5/5-5 2/5)=1 3/5x1/4=8/5x1/4=2/5x1=2/5
(7/9-47/72):1 1/4=(56/72-47/72):5/4=9/72x4/5=9/18x1/5=1/2x1/5=1/10