What would set +e and set -x commands do in the context of a shell script?

I'm looking at a shell script that contains the following:

set +e
set -x

I see that the commands are used to "assign a value to a shell variable". But in this context I don't understand the usage.

https://afni.nimh.nih.gov/pub../pub/dist/edu/data/CD.expanded/AFNI_data6/unix_tutorial/misc/unix_commands.html#set

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