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I just answered this question under this link
https://www.algebra.com/algebra/homework/logarithm/logarithm.faq.question.1118991.html
https://www.algebra.com/algebra/homework/logarithm/logarithm.faq.question.1118991.html
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comment from student: Hi! Thank you for your help on this question. The answer however is not 6.5.
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My response:
Can you find, identify and read MY (ikleyn's) response under that link ?