Find the location of businesses that has business hours from 7 am to 7 pm every Wednesday.
location of business refers to city; business hours from 7am to 7pm refers to opening_time = '7AM' AND closing_time = '7PM'; Wednesday refers to day_of_week = 'Wednesday'
SELECT DISTINCT T1.city FROM Business AS T1 INNER JOIN Business_Hours AS T2 ON T1.business_id = T2.business_id INNER JOIN Days AS T3 ON T2.day_id = T3.day_id WHERE T2.opening_time = '7AM' AND T2.closing_time = '7PM' AND T3.day_of_week = 'Wednesday'