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  1. !! +exec+ +var+ +string+
  2. $lst_tit evalsubst$lst_titend$type_both
  3.   $lst_alias evalsubstit, evalsubstitute, evaluesubst,
  4.     evaluesubstit, evaluesubstitute
  5.   $(lst_syntax)evalsubst $emph name=val $emphend in $emph
  6.   expr$emphend</tt>
  7.   $lst_mean Manipulation of mathematical expressions: substitute variable
  8.   $emph name$emphend by $emph val$emphend in $emph expr$emphend, then
  9.   evaluate the expression to a real number. <br>
  10.   No regular expression is allowed in $emph name$emphend. <br>
  11.   See also the commands
  12.   $(ref1)cmdlist_mathsubst_&+cmd_choose=all$(ref2)cmdlist_mathsubst_">!mathsubst</a>,
  13.  $(ref1)cmdlist_replace_&+cmd_choose=all$(ref2)cmdlist_replace_">!replace</a>.
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