The toll to a bridge is $3.50 A three-month pass costs $15.00 and reduces the toll to $0.50 A six-month pass costs $41 and permits crossing the bridge for no additional fee. How many crossings per three-month period does it take for the three-month pass to be the best deal (assuming a consistent number of crossing for all three-month periods)?
Let x represent the number of crossing in three-month period. For what value of x is the three-month pass the best deal?
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