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You lose value on this hand if the turn comes and villian is ahead of you. Right now you are even money. Villian doesn't hate his hand, so push him in now and hope he calls. If he folds you take his $7. Sounds like a good deal to me.

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The problem with a huge overbet now is it's only called by a much better hand. Maybe an overpair (which you don't mind), but more likely only a set or two pair, both of which are favourites against you.