Quick Fix Inc. repairs bikes. Their revenue, in dollars, can be modeled by the equation y = 400 + 220x, where x is the number of hours spent repairing bikes. Their overhead cost, in dollars, can be modeled by the equation y=20x2+160 , where x is the number of hours spent repairing bikes.

After how many hours does the company break even?

Note: The phrase break even refers to the value where the two functions are equivalent.

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