Get an impact wrench...hit the bolt so you can get it to atleast turn and that will break it free inside, then if you have to, hit the threaded end of the bolt with a hammer to back it out. Just try not to damage the threads on it. When you do get the bolt out, wire wheel it clean and put some antisieve around it before you put it back in so you dont have this problem in the future.

Also, your sway bar link boot is missing on one of your links :)