>>> How much was the termination fee for the University of Texas and Oklahoma University to leave the Big 12 conference? 

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The response should be $100 million. This is based on the information provided in the context that the Big 12 announced in February 2023 that Texas and Oklahoma had negotiated a combined $100 million early termination fee to leave for the SEC a year before their media rights deal with the Big 12 was set to expire.