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(x - 3y)(x + 3y)
36x² - 16y²
(6x - 4y)(6x + 4y)
49a² - 1
(7a - 1)(7a + 1)
49a² - 64b²
(7a - 8b)(7a + 8b)
121 - 100p²
(11 - 10p)(11 + 10p)