need some basic EV help

[SimaoMacaco]

I need some maths help please.. here is my problem

On the turn I bet $7 that was called to make a pot of $23.95, I am 92% fav at this point.

I am all in on the river regardless and he somehow sucks out to the nuts.. He bets 43.78 which i call. This seems +EV maybe not optimal but not -EV. I am trying to calculate exactly how +EV it is.. so i can see if my session was good/bad/sucked out.

I think i can calculate it thus..

assume

HWR = his win rate
then HWR = (1/(1-0.92))

-(HWR*$7) = -87.5

to win the river bet of $43.78+pot-turnbet

not sure if this is right.. bright maths peeps please help!