>>> What team other then Texan Longhorn accept an invitation to the SEC in July 2021? 

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Based on the context provided, the only other team that accepted an invitation to join the SEC, other than the Texas Longhorns, was the Oklahoma Sooners. Both Texas and Oklahoma were invited to join the SEC in July 2021, and they accepted the invitation with the intention of joining the conference no later than the 2025 season.