PW > 1/( (P/B) + 1)

is exactly the same as p(W) > B/(B+P) DUCY?
My original final solution is equivalent to this, though your variable names are more convenient.

Then all we need to do, is simply determine p(W) by rule of 2 or 4, and know what the bet and the pot is and we can easily see of the call is +ev.