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hi,
that is exactly what im looking for! Thank u guys!!

hi guys,
i need some little math operation in my tex code, i wana do some operation as follows:

\newcommand \NumAA{aa}
\newcommand \NumAA{ab}
\newcommand \NumAA{ba}
\newcommand \NumAA{bb}
%where aa,ab,ba,bb some numerical values
\newcommand \z {\NumAA + \NumAB}
\newcommand \n {\NumBA + \NumBB ...