a) (2x+5)(x-4)=(x-5)(4-x) b) 9x^2-1=(3x+1)(2x-3)c) 2(9x^2+6x+1)=(3x+1)(x-2)d) 27x^2(x+3)-12(x^2+3x)e) 16x^2-8x+1=4(x+3)(4x-1)
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