SELECT LOCATION FROM track WHERE seating  >  90000 INTERSECT SELECT LOCATION FROM track WHERE seating  <  70000
Find the locations where have both tracks with more than 90000 seats and tracks with less than 70000 seats.
[Schema (values) (types)]: | race_track |  race : race_id (text) , name (number) , class (text) , date (text) , track_id (text) | track : track_id (text) , name (number) , location (text) , seating (text) , year_opened (text);