[M.B.E.]

To make things simpler, I ignored b and d in the formula, so that the formula reduces to p>c/a. I'm not sure how much of a difference that will make but it shouldn't be too much, and b and d as I defined them take too long to calculate.

Anyway, the result I got was that c/a = .417 if you have 5K and the SB has 3K, or you have 3K and the BB has 5K. In all other cases, c/a = .375. That's not a big difference. However, it doesn't quite answer the question, because p depends not only on the two cards you're holding but also on the raising standards of your opponent.