CREATE TABLE table_76696 ("Position" TEXT, "Team #1" TEXT, "Agg." TEXT, "Team #2" TEXT, "1st leg" TEXT, "2nd leg" TEXT)

What is the 1st leg with a 4-3 agg.?
SELECT "1st leg" FROM table_76696 WHERE "Agg." = '4-3'
SELECT "1st leg" FROM "table_76696" WHERE "Agg." = '4-3'