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Place the steak into a sealable bag. Place the peppers and onion into a separate sealable bag. Add the olive oil, lime juice, chili powder, ground cumin, cayenne pepper, salt, black pepper, and garlic to a jar with a screw top or tight fitting lid. Shake until well combined. Pour ⅓ of the marinade over steak, ⅓ of marinade over vegetables and reserve the remaining marinade in the jar for using when cooking the steak fajitas. Seal the bags tightly and refrigerate for one hour to overnight.
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