What is the number of races associated with 7 podiums and a position of 4th?
CREATE TABLE "career_summary" (
  "season" text,
  "series" text,
  "team" text,
  "races" text,
  "wins" text,
  "poles" text,
  "f_laps" text,
  "podiums" text,
  "points" text,
  "position" text
);
SELECT "races" FROM "career_summary" WHERE "position"='4th' AND "podiums"='7';