[luatex] How to correct expand user commands in lualatex?

Alexandr Kozlovskiy k.sasha1994 at yandex.ru
Tue Jan 28 20:49:31 CET 2020

Hello everybody. I try to redefine equation environment,to insert 
actualtext of formula. But if i insert the space after equation,and use 
\expanded command,to correct expand commands,i get for arguments 1,1 
1*1=\protect {\Ustack {\group_begin: 1\group_end: \@@over 1}}
instead of actualtext like
Help me please,how correct expand user commands,to insert correct 
actualtext to formula.In attachment you will see an example,which not 
works for me. Thank you very much for any help.

-------------- next part --------------
\incr at eqnum
  \mathdisplay at push
  \st at rredfalse \global\@eqnswtrue
  \collect at body\DoTaggedEquation\c_space_tl}{
  \mathdisplay at pop

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