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