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Mathematics, 11.09.2021 02:20 vitalitas

PLEASE HELP NEED ASAP PLEASE PLEASE PLEASE Customers of a phone company can choose between two service plans for long distance calls. The first plan has a $9 monthly fee and charges an additional $0.16 for each minute of calls. The second plan has a $21 monthly fee and charges an additional $0.12 for each minute of calls. For how many minutes of calls will the costs of the two plans be equal?

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