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3x = 12
x = 4
b) x² + 7x + 6 = 0
(x + 1)(x + 6) = 0
x = - 1 atau x = - 6
c) -3x² - 5x + 2 = 0
(- 3x + 1)(x + 2) = 0
x = 1/3 atau x = - 2