Write SQL query to solve given problem: How many watchers does the path "maff_se3ue7\US7.sln" have?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T1.Watchers FROM Repo AS T1 INNER JOIN Solution AS T2 ON T1.Id = T2.RepoId WHERE T2.Path = 'maff_se3ue7US7.sln'