Thanks a lot  Jim, Dennis.
Jim, actually where "dots" were I meant "etcetera" or "similar data". ;)
My output is close to that one Dennis proposed with function aggregate, but
i would like to keep the column var2 and the rest of columns with the unique
value corresponding to var1 greatest value, So suppose the example is:

  var1    var2     …    varN
  122     nnn1    …     1
  213     nnn2    …    2
  422     nnn4    …    2
  432     nnn5    …    3
  441     nnn6    …    4
  550     nnn7    …    4
  500     nnn8    …    4

The output were:

 var1    var2     …    varN
  122     nnn1    …    1
  635     nnn4    …    2
  432     nnn5    …    3
  550     nnn7    …    4

Maybe that´s the reason for what I want to keep the "indexes" where the
conditions are satisfied ( unique varN, sum of var1 were varN are the same,
and value of var1 that is the greatest relative to the others same-VarN
values).

Thanks for your help!
Chriss Paúl.

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