Question 903559
Exactly as described, {{{3/7+1/3}}}.


For any real number K, 
{{{1*K=K}}}
Also for any number N, {{{N<>0}}},
{{{N/N=1}}}.


This means you can do this:
{{{3/7+1/3=(3/7)*(3/3)+(1/3)(7/7)}}}




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Your expression will NOT be a mixed number.