#1 `GLIBCXX_3.4.21' not found when running OraExp.sh

[Arlington1985]

When run OraExp.sh file get the following error

/home/rovshan/OraExpLinux64/./lib/OraExp: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.21' not found (required by /home/rovshan/OraExpLinux64/./lib/OraExp)

I am using Red Hat Enterprise Linux Workstation release 7.5 (Maipo) and Package libstdc++-4.8.5-28.el7_5.1.x86_64 already installed

[Arlington1985]

Fixed by my own:
Need to place attached file under/ usr/lib64 folder and replace libstdc++.so.6 symbolic link with downloaded file with the following command:

sudo ln -fs libstdc++.so.6.0.21 libstdc++.so.6