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[Jan Lellmann <address@hidden>]

Hello,

why don't these two definitions evaluate to the same macro? Specifically, 
the first one extends the box, the second doesn't:

  <assign|test1|<macro|body|<resize|<arg|body>|l-5mm||r+5mm|>>>


<assign|test2|<macro|body|<resize|<arg|body>|<minus|1l|5mm>||<plus|1r|5mm>|>>>

If the second line is not supposed to work, how can I resize a box if the 
offset is stored in a variable (instead of the hard-coded 5mm)?

Jan