39/5:13/5=9/2:b
39/5×5/13=9/2b
3/1=9/2b
6b=9
b=9/6
b=3/2
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39/5:13/5=9/2:b
39/5×5/13=9/2b
3/1=9/2b
6b=9
b=9/6
b=3/2