[Girchuck]

Limping with this hand will get you in trouble very often.
Throw it away, unless you have a good chance to steal. After MP limps, you do not have a good chance to steal.

On the flop, you have a weak draw with only 3 outs to the nuts. You need to make it cheap for you and the overcallers. On the other hand, you'd like anyone with the K to fold. Balance it out. There is 5SB in the pot, if you call, maybe you'll get one or two more, so your pot odds are 1 to 6, provided that neither blind is check-raising, which they could be. And you have 3 7s to give you nuts, a dirty 7, and 4 very dirty ladies. This is a borderline fold.

If you raise and fold the blinds, your pot odds are 2-6 but you probably can count on 8 outs plus about 4 outs of folding equity. If you raise and a blind calls two, you don't have 8 outs, but your odds ar 2-8, still this is one of the worst cases. In the likely worst case, you will be re-raised. You really do not want to be re-raised with this hand.

Turn brings you a pair and a mediocre flush draw, which does increase your number of outs. If you think MP is unlikely to have an A, and will release a J, raising is a good play, because the turn raise is quite scary for anyone who doesn't hold an A or a pat hand. If MP is betting a broadway gutshot, you actually have the best hand, and don't want to see a Q or an 8 on the river. Is this MP likely to bet a broadway gutshot?