What is the away team score of a Melbourne team that has a home team score of 12.7 (79)?
CREATE TABLE "round_6" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "date" text
);
SELECT "away_team_score" FROM "round_6" WHERE "home_team_score"='12.7 (79)' AND "away_team"='melbourne';