CREATE TABLE table_55681 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

Which team has an away score of 7.9 (51)?
SELECT "Away team score" FROM table_55681 WHERE "Home team score" = '7.9 (51)'
SELECT "Away team score" FROM "table_55681" WHERE "Home team score" = '7.9 (51)'