Mike repairs televisions. His revenue, in dollars, can be modeled by the equation y = 25 + 30x, where x is the number of hours spent repairing televisions. His overhead cost, in dollars, can be modeled by the equation y=5x2-10, where x is the number of hours spent repairing televisions. After how many hours does he break even? Note: The phrase break even refers to the value where the two functions are equivalent.
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