# Get all yum commands previously run
yum history list all
# Get the details of the command
yum history info [entry number]
# Undo each command top-down
yum history undo [entry number]
*NOTE: You have to be careful not to undo the initial system install!
Source: Completely restore centOS 7 as it was on first installation ( Factory Reset) | WIKI CODE (wikicoode.com)
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