Answer:
11x³ + 7x² + 2xy + 3y - (7x³ + 5x² - 6xy - y²) =
11x³ + 7x² + 2xy + 3y - 7x³ - 5x² + 6xy + y² =
4x³ + 2x² + 8xy + 3y + y²
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