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18
1 x 18
2 x 9
3 x 6
x² - 3x - 18
x² + 3x - 6x - 18
x(x + 3) - 6(x + 3)
(x - 6)(x + 3)
x - 6 = 0 atau x + 3 = 0
x = 6 x = - 3