What was the week 7 opponent for the year that had a week 12 opponent of Oregon State (7-3)?
CREATE TABLE "ap_poll" (
  "week_2_sept_7" text,
  "week_3_sept_14" text,
  "week_4_sept_21" text,
  "week_5_sept_28" text,
  "week_6_oct_5" text,
  "week_7_oct_12" text,
  "week_10_nov_2" text,
  "week_12_nov_16" text,
  "week_14_nov_30" text,
  "week_15_dec_7" text,
  "week_16_final_jan_9" text
);
SELECT "week_7_oct_12" FROM "ap_poll" WHERE "week_12_nov_16"='oregon state (7-3)';