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When you install the repository RPM (the RPM that gives you the sources, not the binaries RPM itself) it gives you many alternatives in the source file, that you have to turn off or on. I would turn off 8.x and enable 5.7
From : /etc/yum.repos.d/mysql-community-source.repo
# Enable to use MySQL 5.7
name=MySQL 5.7 Community Server
enabled=1 ## Here
name=MySQL 8.0 Community Server
enabled=0 ## Here