How did I install Erlang to CentOS 7?

yum install epel-release
wget https://packages.erlang-solutions.com/erlang-solutions-1.0-1.noarch.rpm
rpm -Uvh erlang-solutions-1.0-1.noarch.rpm
yum install erlang

tecadmin.net/install-erlang-on-centos

Then I checked the installed Erlang version.