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OpenStudy (anonymous):
Customers of a phone company can choose between two service plans for long distance calls. The first plan has a $21 monthly fee and charges an additional for each minute of calls. The second plan has a $30 monthly fee and charges an additional $0.09 for each minute of calls. For how many minutes of calls will the costs of the two plans be equal?
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OpenStudy (anonymous):
Once again for the first plan, charges are an additional what?
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