Factorise 4asquare minus 9bsquare minus 2a minus 3b
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(4a^2 - 9b^2) - (2a - 3b)
(2a)^2 - (3b)^2 - (2a - 3b)
(2a + 3b) (2a - 3b) - (2a - 3b)
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