Yes, this can be repaired. First, seal the damaged walls with Kilz or equivalent primer. This will keep everything together. If any paper bubbles after priming it will need removal before proceeding.

Now all of the damaged areas can be floated over with drywall mud. Most likely it will take 2 or more coats. Allow the final coat to dry, sand smooth then prime again before painting. A texture can also be added after the final coat of drywall mud.

To repair the damaged drywall, you will need to follow these steps:

1. Clean the area: Remove any loose debris and clean the surface thoroughly.

2. Apply joint compound: Use joint compound to fill in the areas where the drywall paper was removed. Apply it smoothly and evenly using a putty knife.

3. Sand the compound: Once the joint compound is dry, sand it down until it is smooth and level with the rest of the wall.

4. Apply primer: Prime the repaired area to ensure proper adhesion of the new wallpaper or paint.

5. Texture the area (optional): If there is texture on the rest of the wall, you may need to match it by texturing the repaired area.

6. Paint or apply new wallpaper: Once the primer is dry, you can paint the repaired area to match the rest of the wall or apply new wallpaper.