12000:(840-280*96:42)=60
1)280*96=26880
2)26880:42=640
3)840-640=200
4)12000:200=60
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12000:(840-280*96:42)=60
1)280*96=26880
2)26880:42=640
3)840-640=200
4)12000:200=60
280*2=560
840-560=280
12000:280=42 целых 6/7