A subject in a psychology experiment who practices a skill for x hours and then rests for y hours achieves a test score of f(x, y) = xy - x² - y² + 7x - 2y + 130 (for 0 ≤ x ≤ 10, 0 ≤ y ≤ 4). Find the numbers of hours of practice and rest that maximize the subject's score. ([ (x, y) =

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