Factorise 9-12+4
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9X^2-12X+4
9X^2-6X-6X+4
3X(3X-2)-2(3X-2)
(3X-2) (3X-2)
9X^2-6X-6X+4
3X(3X-2)-2(3X-2)
(3X-2) (3X-2)
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