Since I'm assuming that you were planning on replacing at least the hose, try some heat from a very small torch flame applied to the metal end of the hose, even the heat from a propane or butane torch would usually cause the hose end to expand enough to allow you to loosen the nut. First soak the line above the nut and and the hose connection liberally with Liquid Stench or whatever solvent that works for you. The other problem in a situation like this is that the nut has rusted to the tube and turning the nut will twist the tube. Before heating the area, be sure to wipe off all of the residual liquid, and as always, when working with flames under a car, keep some kind of fire extinguisher handy. If you can get it apart, the condition of the hex on the nut doesn't really matter as long as you can get enough of a grip on it with a vise grip or whatever to tighten it.
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