A company manufactures two types of athletic shoes, jogging shoes and cross trainers. The total revenue from x units of jogging shoes and y units of cross trainers is given by the following equation, where x and y are in thousands of units. R(x, y) = -3x2 - 8y² – 2xy + 48x + 108y Find the values of x and y to maximize the total revenue. (x, y) =

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