The problem
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I don't under stand 2nd step. Where does -6 and 4 come from?
Answer provided by our tutors
The best way to examine a solution is to click on a particular step. I would also encourage using 'a few steps' first (click on the 'Options' tab) and increase the number of solution steps as the additional steps are helpful.
Below is the logic for '-6' and '4':
