I have trashed so many posters with similar damages. To me, anything post 1985 needs to be in absolute mint condition. 1985 is the year I have decided everything needs to be rolled and mint. Prior to that, I'm okay with folds and minor damages like pin holes. There are only a handful of rare posters post 1985 (Pulp Fiction Lucky Strike for example, just because of what some collectors have decided it's worth) that you could potentially restore. IMO, of course. 99% of them can be found mint (and in your case double sided) for very little money. So keep this one rolled somewhere if it holds sentimental value, and get a DS mint one on Ebay.
T