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I would split this into its individual parts, take many, many backups, and do things in baby steps.
Looking at your base OS, I'd definitely say you should do that first. Back everything up, spin up a new CentOS 7 machine, bung EPEL and the Remi PHP 7 repositories in it. Restore the backups to the new image and test everything out, then close your active forum, dump the database, replace the database on the new board, and get rid of your old system entirely.
You're then on PHP 7, with vBulletin 5.4.5 still. So from there, back up, and go ahead with your upgrade. 5.4.5 to 5.5.2 should be pretty straightforward, but make sure you take a backup before you start in case anything untoward happens.
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