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81
1 x 81
3 x 27
9 x 9
3m² - 27
3m² + 9m - 9m - 27
3m(m + 3) - 9(m + 3)
(3m - 9)(m + 3)
3m - 9 = 0 atau m + 3 = 0
3m = 9 m = -3
m = 9/3
m = 3