Frequent Questions about our Solver

The problem

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I do not understand where the 39 comes from

Answer provided by our tutors

Subtracting '6' from 45.  It is also good to point out the 'Options' tab, as starting off a solution with 'a few steps' is generally better in order to avoid extra solution steps which can lead to some confusion.  Finally, clicking on a particular solution step shows the logic which is employed. 

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