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= 6x(2x + 3y) - 5y(2x + 3y) = (6x - 5y)(2x + 3y)
2). 15x² - 11xy - 12y² = 15x² - 20xy + 9xy - 12y²
= 5x(3x - 4y) + 3y(3x - 4y) = (5x + 3y)(3x - 4y)
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