2/3:7/9=2/3*9/7=6/7
6/1*5/3=10
9/4*4/15=3/5
20/21*1/15=4/63
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2/3:7/9=2/3*9/7=6/7
6/1*5/3=10
9/4*4/15=3/5
20/21*1/15=4/63