Our teacher told us this is the hardest AP Chem equation balance question he's ever come across. He gave our whole class an hour to do with no success. I have the answer now, but would like to test CollegeConfidential's intelligence =). Lets seeee.
Copper (I) sulfide plus hydrogen nitrate yields copper (II) nitrate plus copper (II) sulfate plus nitrogen dioxide plus water.
I guess whoever gets it right deserves major bragging rights. Good luck!