The Dallas Burn had a 12-9-7 record and what number of goals for? 
CREATE TABLE "table1_1253396_5" (
  "club" text,
  "overall_record" text,
  "goals_for" real,
  "goals_for_avg" text,
  "goals_against" real,
  "goals_against_avg" text
);
SELECT "goals_for" FROM "table1_1253396_5" WHERE "overall_record"='12-9-7';