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1 or 9: What's the answer to the latest viral math equation?

Have you seen the latest viral tweet? 78 million people have seen this equation and more than 18,000 are disagreeing about the answer over on X/Twitter.We asked Patrick Kirkland, a professor of the practice in the Alliance for Catholic Education, to weigh in ... and show his work.(Hint: The answer is 9, but he understands why you might say 1.)