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Mathematics

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simplify the expression x² - 3xy - 5xy - 7y² + 4x² + 8y²

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x² - 3xy - 5xy - 7y² + 4x² + 8y²

First, let's re-arrange

x² + 4x² - 3xy - 5xy - 7y² + 8y²

5x² - 8xy + y²

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