AMC10 2013 10B, Problem 1

What is $\frac{2+4+6}{1+3+5} - \frac{1+3+5}{2+4+6}$?

Solution: This expression is equivalent to $\frac{12}{9} - \frac{9}{12} = \frac{16}{12} - \frac{9}{12} = \fbox{\frac{7}{12}}$ For the exact same problem but with answer choice D unsimplified, see

Answer: \frac{7}{12}