a) 2x3-4x2+2xb)x3+5x2-5+5c) a2-b2+4b-4d)x2-y2-6x+9e)3x4y2+3x3y2+3xy2+3y2f)x2+4y2-5x-10y+4xyg)x2-3x-3y-y2
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