https://bugs.documentfoundation.org/show_bug.cgi?id=98704

            Bug ID: 98704
           Summary: formula lost after saving to Microsoft Powerpoint pptx
                    file
           Product: LibreOffice
           Version: 5.1.1.3 release
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Impress
          Assignee: libreoffice-bugs@lists.freedesktop.org
          Reporter: dpars...@emerall.com

Created attachment 123622
  --> https://bugs.documentfoundation.org/attachment.cgi?id=123622&action=edit
trival example, odp file

I add equation formulas to a presentation document in OpenOffice Impress and
save as pptx ("Microsoft Powerpoint 2007-2013 XML").

When I then open the pptx file in OpenOffice, the formula is lost, blank.  The
box for the formula is still there, I can find it by pressing tab. But it is
empty and it cannot be edited.

I am attaching a trivial example with a new default presentation (no template),
adding one formula (just to the right of the text "Formula:"), y=x^2.  I saved
the document from LibreOffice first as odp, and then saved as pptx.

Microsoft Office 2010 (14.0.6023.1000 32 bit) can read both the odp and the
pptx file with some success.  Office says both are damaged and tries to repair
them.  It shows the odp properly formatted after repairing.  Office shows the
pptx file after repairing, but misrenders the formula as
  y
  =x^2
instead of
  y=x^2

But LibreOffice does not show the formula in the pptx file at all. (It reads
the odp file fine, of course)

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