Find the location of businesses that have business hours from 8 am to 9 pm every Friday.
location of businesses refers to city and state; business hours from 8 am to 9 pm refers to opening_time = '8AM', closing_time = '9PM'; every Friday refers to day_of_week = 'Friday'
SELECT 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.closing_time LIKE '9PM' AND T2.opening_time LIKE '8AM' AND T3.day_of_week LIKE 'Friday' GROUP BY T1.city