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Ok so I am playing like a moran and this happens...

Flop: ($10.75) T[img]/images/graemlins/diamond.gif[/img] J[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/diamond.gif[/img] (4 Players)
UTG checks, <font color="red">Hero bets $7.50</font>, <font color="red">CO raises to $15</font>, <font color="red">BTN raises to $25.08 and is All-In</font>, UTG folds

now I figure my equity is about 30% or thereabouts, is this a (very thin) push now or an obv fold?

Is my equity calc here waaaaaaaay off?

If I check the flop CO bets and BTN pushes is a push a viable option? Or am I losing the plot?