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Let c be the regular cost of each chair.
Since Rhianna buys 6 chairs and receives a one-time discount of $55, the total cost she pays is $455. Therefore, we can set up the equation:
6c - 55 = 455
Solving for c:
6c = 455 + 55
6c = 510
c = 510 / 6
c = 85
Therefore, the regular cost of each chair is $85.