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Carrie's Catering is having a special on their box lunches. The minimum purchase is 14 boxes for $126. Each additional box is $7. If x represents the number of boxes over the minimum, which of the following equations represents the cost of box lunches during this special?
A. y = 7x + 126
B. y = 126x + 7
C. y = 126x - 7
D. y = 126 - 7x