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[@jackyu5412]

Making an easy solution complicated

[@caseymcdonald6292]

I appreciate you taking the time to describe how and why the properties apply, even if there was a quicker way to find the solution

[@greenmanofkent]

Why do you go through all that when the quick answer - in two steps - is b = log(72) / log(5) ? Surely it is just as correct as what you got, and just as easy to resolve on a calculator.