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x² + 15x + 4x + 60
x² + 19x + 60
(2y-5)(2y+3)
4y² + 6y - 10y - 2
4y² - 4y - 2
(4x-3)(5x-2)
20x² - 8x - 15x + 6
20x² - 23x + 6