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3x² - x + 27x - 9 = 0
x (3x-1) + 9 (3x-1)
(3x-1)(x+9)
* 3x- 1 = 0 ⇒ 3x = 1 ⇒ x = 1/3
* x + 9 = 0 ⇒ x = -9