well, with you have the blockers of "A" and "K" and the "7" is the lowest card in table, you can figure that he is probably going to some flush draw or some 3 of kind mostly
its very difficult for me to read this certain situation.if someone has any pair then with the same card down he got threes and personally i think its very difficult to read it.so try to loose as little amount you can
Need more information. What was your opening bet and subsequent bets? What was the flop? I'm assuming you had pocket AK and somewhere along the line an Ace and a King appeared. I'm also assuming that the bad guy had pocket 7s and picked up the other 7 on the flop to make a set. Any other combination and he would have had a boat. Sets are almost impossible in any given situation to read.
Running Nose II - It initially was a 5x bet on my behalf. Everything happened on the flop. He called all-in and I committed and lost all of my chips. I'm relatively new to this game so I'm always looking or improvements.