/usr/lib/mime/packages/libreoffice-math is in libreoffice-math 1:4.3.3-2+deb8u11.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# shared-mime-info
# Generic
text/mathml; soffice --nologo --math '%s'; edit=soffice --nologo --math '%s'; test=test -n "$DISPLAY"; description="MathML Formula"; nametemplate=%s.mml; priority=3
# OASIS OpenDocument Format
application/vnd.oasis.opendocument.formula; soffice --nologo --math '%s'; edit=soffice --nologo --math '%s'; print=soffice --nologo --math -p '%s'; test=test -n "$DISPLAY"; description="OpenDocument Formula"; nametemplate=%s.odf; priority=9
# OpenOffice.org 1.0
application/vnd.sun.xml.math; soffice --nologo --math '%s'; edit=soffice --nologo --math '%s'; test=test -n "$DISPLAY"; description="OpenOffice.org Formula"; nametemplate=%s.sxm; priority=8
#
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