Write SQL query to solve given problem: What is the first name of the customers whose address is in the postal code that begins with 76?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T1.first_name FROM customer AS T1 INNER JOIN address AS T2 ON T1.address_id = T2.address_id WHERE SUBSTR(T2.postal_code, 1, 2) = '76'