Accessible pdf alt text read twice by on-screen reader

We are working on a math text book. We are currently creating an accessible pdf in addition to a text book for people who are visually impaired. We have ordered our text such that the on-screen reader reads the pages in the correct order and have tagged sections appropriately. However, some paragraphs contain several symbols that the on-screen reader cannot comprehend and for those we have made figures and inserted alt text that literally explains the equations. The problem is that the on-screen reader will first read the alt text but then will proceed to read the text itself that we are trying to replace. Thus many paragraphs are read twice. Please advise.

Hi,
Alternate Descriptions:
PDF documents may be enhanced by providing alternate descriptions for images, formulas, or other items that do not translate naturally into text.
But, you have content that does translate naturally into text. So, you get the alternate text entry and the content that is naturally renderable.
Consider use Replacement Text (Actual Text) or, when appropriate for abbreviations/acronyms, Expansion Text.
However, if the characters are naturally renderable, there is no need for any of these.
Do apply the PDF element for "formula" to the equation content.
Only use alternate text descriptions for image/graphic objects present in the PDF.
Avoid having other tagged content being associated with a child tag of a tag that has alternate or actual applied.
You may find having a copy of ISO 32000-1:2008 available helpful.
Obtain a free version oF ISO 32000-1.
http://www.acrobatusers.com/blogs/leonardr/adobe-posts-free-iso-32000
Be well...

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