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Correct, if someone currently has you beat it's break-even if you get them both to go with you (and they both have you covered, minor detail there).
But that's all in the frame of they probably don't have you currently beat. They're probably on the draw, in which case it's a matter of looking at their combined draws vs their individual draws. Let's assume one has an OESD and the other's on the flush draw. OSED has 8 clean outs to improve over you, flush draw has 8 clean outs as well (you're holding the 7h). They share 2 of them. So individually they have 8, together they have 14. 8 outs is 31.5% to hit, 14 is 51.2.
Just to make things easier on me, let's assume you all started with $10 (close enough to reality here). Pre-flop is minor compared to the post flop stuff, so let's keep that money live. You're going to push at "???", let's see the EV for if one calls vs if both call. (Also falsly assuming if they hit an out that you won't hit yours to come over - sue me)
One caller - final pot $23, your contribution $10, your chance of winning 68.5%
EV: .685 * 13 - .315 * 10 = 5.755
Two callers - final pot $30, your contribution $10, your chance of winning 48.8%
EV: .488 * 20 - .512 * 10 = 4.64
So in this case it's better if you only get one caller.
But that was the worst case - the two draws shared as few outs as possible. If they're both on the same OESD their combined outs is 8 and the EV for two callers over one is 10 more---huge.
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