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Patricky
17 June, 12:39
4xsquared-3xy+9ysquared-3 (5xy+7ysquared)
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Ruben Cochran
17 June, 13:05
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4x² - 3xy + 9y² - 3 (5xy + 7y²)
4x² - 3xy + 9y² - 3 (5xy) - 3 (7y²)
4x² - 3xy + 9y² - 15xy - 21y²
4x² - 3xy - 15xy + 9y² - 21y²
4x² - 18xy - 12y²
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