Walls scuffed from previous tenants, how to fix?

[Peter K.]

So I'm purchasing an investment property where the previous owner had it rented. It has a lot of scuff marks on the walls, both the bedrooms, should I re-paint the rooms or do I have to re-paint the whole house to match it? Please help. I don't think cleaning it with a magic eraser will help. I definitely have to re-paint. I don't have time to re-paint the whole house or the money to pay for a contractor to do it.