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An air-conditioning company counted 56 invoices at the end of the month. They charge $450 for a new installation and $75 for a service call.

An air-conditioning company counted 56 invoices at the end of the month. They charge $450 for a new installation and $75 for a service call. The total dollar amount of the invoices was $9,450. How many installations and service calls did the company perform?

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