the best way is to redirect from the old domain pages to your new domain homepage with 301. 1st of all you'll have all backlinks saved to your new domain name so you wont lost SERP in google. 2d if someone will find old domain pages he will get to your new domain and website instantly.
you also could just write rewrite rules in .htaccess but is a bit complicated to explain you should read more about .htaccess rewrite rules in the internet.
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done.. vanished ...