twitter/bootstrap — comment on commit fda77e69eb825f6b098a303fedcc96d257b4b050
File: less/mixins.less line 146
By necolas:

In `variables.less` there is: `@gridTotalWidth: @gridRowWidth;` ...so they cancel each other out on this line, meaning it could be reduced to:

(@gridGutterWidth + @gridColumnWidth) * @columns - @gridGutterWidth