Most repackers provide "Language Packs" as separate, optional downloads on their official threads.
Q: Can I install a language pack on a console version of the game? A: No, language packs are typically designed for PC versions of games and may not be compatible with console versions. call of duty mw3 english language pack repack
You downloaded mw3_repack_russian_elamigos.rar . You installed it. You boot it up. you have succeeded.
Launch the game. If the main menu says "Special Ops" and "Campaign" in English, and the first cutscene plays with American/British accents, you have succeeded. call of duty mw3 english language pack repack