You want to delete your account from your phone or delete the account entirely?
To remove the account from your phone, you go into Settings > Accounts > Google Select the account, tap the 3-dot menu in the top right and select to remove it from your device.
To delete your Google account entirely (I suggest making a backup of it, doing a download from Google if you can), go to
https://myaccount.google.com and the delete account link is on the right side.
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