Assuming you have the car up on jackstands and the wheel is off, I would spray the bolt liberally with penetrating oil (i.e. not WD-40). Something along the lines of P'Blaster, Kroil, or something similar.
After a few applications of that, a few taps using a drift and a hammer of decent mass should pop it right off. I typically use a large punch, but a 3/8" drive ratchet extention should work as well. Wear safety glasses.
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