Are you trying to get the nut off the bolt? if so then two ptions: screw the nut back in and assuming you have some threads on the end, chase the treads with a tap/die set. If no threads left on the end of the bolt, use the nut itself as a die and power it over the rough spots to create threads. You should then replace the nut.
If the question is really about removing the bolt I can't help as i have never messed with that part of the car and am away from home so can't climb under to take a look.
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