The monthly marketing and automated equipment cost (in millions of dollars) for a car company is given by C(x, y) = 3x2 + 2xy + 2y2 -18x - 16y + 356, where x is the amount spent per month for marketing and y is the amount spent per month on automated equipment (both in millions of dollars). Determine how much should be spent on each per month to minimize the total cost.

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