I figured out how to add shared module and here is explanation:
> Go to `/etc/httpd/conf.modules.d`
>
> Create file with `.conf` extension in which you'll put you settings for shared module: `touch proxy_module.conf`
>
> Add this to `proxy_module.conf` : `LoadModule proxy_module modules/mod_proxy_balancer.so`
>
> Restart apache: `systemctl restart httpd`
After all this steps you can use benefits of shared module.