In these three verses only the day (seventh) and the number of bulls (seven) are different from verses 20-22 (see the comments there). Seventh and seven are a pairing of the sacred number (so Alter, page 835). Concerning Good News Translation‘s reduction of the text in verses 30-31, see the comments on verses 18-19.

Quoted with permission from de Regt, Lénart J. and Wendland, Ernst R. A Handbook on Numbers. (UBS Helps for Translators). Miami: UBS, 2016. For this and other handbooks for translators see here .