CREATE TABLE table_63986 ("Team #1" TEXT, "Agg." TEXT, "Team #2" TEXT, "1st leg" TEXT, "2nd leg" TEXT)

What was the first leg score of the matchup with a 2nd leg of 80-70?
SELECT "1st leg" FROM table_63986 WHERE "2nd leg" = '80-70'
SELECT "1st leg" FROM "table_63986" WHERE "2nd leg" = '80-70'