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6
1 x 6
x² - 7x + 6
x² - 1x - 6x + 6
x(x - 1) - 6(x - 1)
(x - 6)(x - 1)
= x² - 6x - x + 6
= x(x - 6) - (x - 6)
= (x - 1)(x - 6)