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A cell phone plan costs ​$26.70per month for 700 minutes of talk time. It costs an additional ​$0.05 per minute for each minute over 700 minutes. To get​ e-mail access, it costs 20​% of the price for 700 minutes of talk time. Your​ bill, which includes​ e-mail, is the same each month for 9 months. The total cost for all 9 months is ​$321.66 . Write and solve an equation to find the number of minutes of talk time you use each month.