(x-3)2 - x2-6x+9, (x+5)·(x-5) - x2-25, (7-a)2 - 49-14a+a2, -(2x-3)·x - -2x2+3x, (3x-1)2 - 9x2-6x+1, (b-3)·(b+3) - b2-9, (a+5)2 - a2+10a+25, (2b-7)2 - 4b2-28b+49,

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