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(2a^2+3a-8a-12)
(2a^2-5a-12)
2.(a+3b)(2a-3b)
(2a^2-3ab+6ab-9b^2)
(2a^2+3ab-9b^2)
3.(-3-p)(5+p)
(-15-3p-5p-p^2)
(-15-8p-p^2)
4.(5+a)(7-a)
(35-5a+7a-a^2)
(35+2a-a^2)