6 1/2:1 6/7=13/2*7/13=7/2=3 1/2 6 2/3:2 7/9=20/3*9/25=12/5=2 2/5
6 1/2:1 6/7=13/2*7/13=7/2=3 1/2 6 2/3:2 7/9=20/3*9/25=4/1*3/5=12/5=2 2/5