sed (or awk) to sum values in a csv file -

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I have a CSV file where lines look like this: 

  foo, bar To change the last 3 values ​​in a nutshell, I need a command:     
   
 If possible I need a liner.   
 
 
  awk -F, '{print $ 1, $ 2, $ 3, $ 4 + $ 5 + $ 6} '"Post-Text" itemprop = "text"> 
 OFS =, file   
 and not for a fixed length:  < Printf ("% s,", $ i)} {Print $ NF + $ (NF- 1) + $ (NF-2)} 'file   
 is not the right tool for arithmetic.

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