1) 4-16/9=36/9-16/9=20/9
2) 20/9:7/15=20/9*15/7=100/21
3) 12 7/15-100/21=187/15-100/21=1309/105-500/105=809/105
4) 809/105+3/9=2427/315+105/315=2532/315=8 12/315=8 4/105
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1) 4-16/9=36/9-16/9=20/9
2) 20/9:7/15=20/9*15/7=100/21
3) 12 7/15-100/21=187/15-100/21=1309/105-500/105=809/105
4) 809/105+3/9=2427/315+105/315=2532/315=8 12/315=8 4/105