Evaluate the following : {:(a.,|20 - 9|,b.,|16-7|),(c.,|3-(9-1)|,d.,|15-(20 - 11)|),(e.,|21 - (39 - 11)|,f.,|28 - (32 - 15)|):}

Evaluate the following : {:(a.,|20 - 9|,b.,|16-7|),(c.,|3-(9-1)|,d.,|

1.	Evaluate the following : {:(a.,\|20 - 9\|,b.,\|16-7\|),(c.,\|3-(9-1)\|,d.,\|15-(20 - 11)\|),(e.,\|21 - (39 - 11)\|,f.,\|28 - (32 - 15)\|):}
Answer» ANSWER :`{:(a.,11,b.,9),(c.,5,d.,6),(e.,7,f.,11):}`