# Bold fraction line

I would like to use a "bold style" for the fraction line in a math formula. I've seen it in some PDFs, but I do not know the proper command.

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## migrated from stackoverflow.comOct 5 '12 at 14:30

I simply solved my problem with a \newcommand:
\newcommand{\thickfrac}[2]{\genfrac{}{}{3pt}{}{#1}{#2}}