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Factorise : 2a + 6b - 3 (a + 3b)²

$2 a + 6 b - 3 (a + 3 b)^{2} = 2 (a + 3 b) - 3 (a + 3 b)^{2} = (a + 3 b) (2 - 3 (a + 3 b)) = (a + 3 b) (2 - 3 a - 9 b)$

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