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6x² + 4x - 27x - 18 = 0
(6x² + 4x) - (27x - 18) = 0
2x(3x + 2) - 9(3x +2) = 0
(2x - 9) (3x + 2) = 0
maka faktor dari 6x² - 23x - 18 = 0 adalah (2x - 9) (3x +2) = 0