The problem
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The last step of this solution says: Explanation for this step does not exist. Can you please help me with that step?
Answer provided by our tutors
The last step in this solution is really not necessary - we will inform the developer, so this can be fixed. The actual solution is the step right before the last (where the entire numerator is factored). The denominator can either be expressed as an integer (64) or in a factored form (2^6) like it is shown in the last step. Either form is right, so you can ignore the last line
Regards
NJ