Mysql: DELETE with IN subquery

DELETE FROM images WHERE image_id IN(
    (SELECT i.image_id FROM images i
    LEFT JOIN ads a ON i.ad_id=a.id
        WHERE ISNULL(a.id))
)
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I need to accomplish this query. Any help will be appreciated. Thanks ;)

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DELETE i
    FROM images i
        LEFT JOIN ads a ON i.ad_id=a.id
    WHERE ISNULL(a.id)