(a +b)2 - (a2 +2ab+b2), (a2 -b2) - (a+b)(a-b), (a -b)2 - (a2 -2ab+b2), (x2+2x+1) - (x+1)2, (3x +9) - 3(x+3), 2x2-2x - 2x(x-1), t2-t - t(t-1), 2x+2 - 2(x+2), 3x+3 - 3(x+1), x2-1 - (x+1)(x-1), 2x+6 - 2(x+3), 9-3x - 3(3-x), x2-4 - (x+2)(x-2), a2-4 - (a+2)(a-2), a3+a2 - a2(a+1), x2-2x+1 - (x-1)2, 2x-2 - 2(x-1), 2a-2 - 2(a-1) , a2-9 - (a+3)(a-3), 3t2+t - t(3t+1), 8x+16 - 8(x+2), 2x4+x3 - 2x3(x+1), 2x5-x4 - x4(2x-1), 4x3-x - x(4x2-1), a4+3a3 - a3(a+3), 7x-14 - 7(x-2), x2-16 - (x+4)(x-4), x2-8x+16 - (x-4)2, x2-3x - x(x-3), a2-4a+4 - (a-2)2,

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