因式分解：(1)(x+3)^2-(3x+9)(2) x(6m-nx)-nx^2 (3) 2-5(3x-2)^2+3x (4) x(b+c-d)-y(d-b-c)-b-c+d (5) (4a-5b)(3m-2p)+(4b-a)(3m-2p)(6) ab(x-2y)-ac(2y-x)+ab(2x-4y) (7) (a-b)^2(a+b)^3-(b-a)^2(b+a)^2
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