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5x-2 = 70

⇒ (x-2) log 5 = log 70

⇒ x = log 70/log 5 + 2

≈ 4.640

(You can use any base you like for the logs, as long as you use the same base for both of them.)

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Q: What is x when 5 raised to the x-2 equals 70?
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