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question in algebraic fractions

I do my school through a program on the computer. (I took a screenshot of my problem below) It's just an example problem, so your not cheating for me haha. NOTE! The question that this is a solution to is** "Find the two consecutive odd numbers such that the sum of two-sevenths of the smaller and one-third of the larger is equal to thirty-one. I'm pretty sure I understand everything but what I have circled (in the picture below). Where did 31 come from?**

http://www.mathhelpforum.com/math-he...1&d=1231954351