Try putting a drill bit on it, but set the drill to run backwards, sometimes this does it
If not , drill the bolt until the head comes off then just push it through the hole
If not, drill a tiny hole (it may take a bit of time and 3 or 4 drill bits) in the bolt itself and then screw a screw into it and then undo it------ps the top 2 answers normally work before you get to this one
HTH
Good luck
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