Marcia makes jewelry to sell at the artists' fair. She spends $120 to rent a stall at the fair for the day and each piece of jewelry costs Marcia $15 in materials. Which equation would compute the number of pieces of jewelry Marcia must sell at the artists' fair such that the average cost per piece of jewelry would be $20? 120 20 = 15x 20 = x+ 120 C 20 = 15x 15x+120 20 =

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