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A jar contains only​ pennies, nickels,​ dimes, and quarters. There are 20 ​pennies, ​24 dimes, and 17 quarters. The rest of the coins are nickels. There are 72 coins in all. How many of the coins are not​ nickels? If n represents the number of nickels in the​ jar, what equation could you use to find​ n?