Calculate the line integral f (−x²y − 3x + 6y + 7) dx + (7xy + 1) dy, where C' is the rectangle with vertices (−2, −3), (−2, 2), (-4, 2), and (-4,-3) oriented counterclockwise. Enter an exact answer. Provide your answer below: fc(-x²y-3x+6y + 7) dx + (7xy+1) dy =

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