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x2 - x -12 = 0

x2 - 4x + 3x -12 = 0

x(x - 4) + 3(x - 4) = 0

(x + 3)(x - 4) = 0

(x + 3) = 0 or (x - 4) = 0

So x = -3 or x = 4

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13y ago

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