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Mathematics 9 Online
OpenStudy (anonymous):

Cormac is making 30 phone calls each week as part of a fundraiser. Last week, he made 9 phone calls on weekdays. Which equation could be used to find x, the number of phone calls he made last week on weekend days? a. 9 + x = 30 b. 30x = 9 c. x - 30 = 9 d. x + 30 = 9

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