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From: Thibault Marin <thibault.marin@gmx.com>
Subject: Re: Equation references in HTML export
Date: Thu, 18 Jan 2018 22:09:05 -0600
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> To avoid having to hack the code, you could try using the mathtools
> package and ask it to only number equations that are referenced:
>
>     \usepackage{mathtools}  
>     \mathtoolsset{showonlyrefs}  

Thanks, if there is a mechanism to alter the preamble when creating the
image, that may be a preferable approach.  I'll try to look into this.