CREATE TABLE table_20758 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Ground" TEXT, "Crowd" FLOAT, "Date" TEXT)

When the away team was Carlton, who was the home team?
SELECT "Home team" FROM table_20758 WHERE "Away team" = 'Carlton'
SELECT "Home team" FROM "table_20758" WHERE "Away team" = 'Carlton'