It's tough without the pot size displayed, but I think you're getting about 7-1 on the turn.

Your outs are tough to evaluate because it depends on whether you're against a K, a flush, or a better 7. Any are possible holdings for the other two. You're ahead of a K, behind a flush with seven outs - ten if someone doesn't have a K - but many of those outs are to a chop if someone has the other 7. Against a better 7, you have three outs to win and six more to chop, unless someone has the K. So it's tough to judge.

Theoretically, 7-1 demands six outs, which would be a generous count, but with the strong possibility that you'll be putting in a few more bets on the turn, and a few more on the river, I'm just fine with folding here. I'd say it's very likely that someone has you beat, and the other guy has/shares some of your outs, in some combination. Interesting hand.