What is the 1st leg with a 4-3 agg.?
CREATE TABLE table_76696 (
    "Position" text,
    "Team #1" text,
    "Agg." text,
    "Team #2" text,
    "1st leg" text,
    "2nd leg" text
)
SELECT "1st leg" FROM table_76696 WHERE "Agg." = '4-3'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the 1st leg with a 4-3 agg.? ### Input: CREATE TABLE table_76696 (
    "Position" text,
    "Team #1" text,
    "Agg." text,
    "Team #2" text,
    "1st leg" text,
    "2nd leg" text
) ### Response: SELECT "1st leg" FROM table_76696 WHERE "Agg." = '4-3'