The problem
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the final step is not explained and it is also not obvious. This is not much help.
Answer provided by our tutors
Sometimes, our algebra solver is not able to produce all the step when problems involve more than regular high school / college algebra material. In such a case it obtains the result from a more powerful computer algebra system which unfortunately doesn't produce steps.
Here is an alternative solution to your problem which involves the use of logarithms:
