Where do your equations come from?
There is MathML, and Microsoft's OMML.
MathML can be converted to OMML (for insertion into docx/pptx/xlsx) via Microsoft's mathml2omml.xsl (included in Microsoft Office installations).
Conversely, there is omml2mml.xsl
If you can use MathML as your source format, then (with a little integration work, perhaps), that MathML could be rendered as SVG.
If your equations are in OMML format, you'd need to convert to MathML first. Try omml2mml.xsl and see also http://dpcarlisle.blogspot.co.uk/2007/04/xhtml-and-mathml-from-office-20007.html