[OS X TeX] How to mark = as just a symbol

Alain Schremmer schremmer.alain at gmail.com
Sun Jan 17 16:25:49 CET 2016

I am running into an error with tcolorbox--a fantastic package--but,  in fact, I suspect that this has nothing to do with the package and just with my general ignorance:


works but


does not. 

I suspect that the second = should somehow be marked as being a mere symbol. Which I don't know how to do.

Embarrassed regards
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