Easy
Expand (x−9)(x+2)(x-9)(x+2)(x−9)(x+2)
x2−7x−18x^{2}-7 x -18x2−7x−18
x2+7x+8x^{2}+7 x+8x2+7x+8
x2−18x^{2}-18x2−18
x+11x+11 x+11
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