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