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Sets and reps are the terms used to describe the number of times you perform an exercise. A rep is the number of times you perform a specific exercise, and a set is the number of cycles of reps that you complete. For example, suppose you complete 15 reps of a bench press.
The 7 is for seven sets of 8-12 reps with 30-45 seconds rest in between. If you don't want to do only one movement in your chest routine then add declines at the end of your workout and do the seven sets to really shock the pecs and force blood into them so they grow.