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During a period of extreme cold, the average daily temperature dropped decreased by 112°F each day. How many days did it take for the temperature to decrease by 9°F? Which equation would you use to find the solution?

A d + 112 = 9d + 112 = 9

B d − 112 =−9d − 112 =−9

C −112d = −9−112d = −9

D 112d = 9