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