Easy
Expand (x−7)(x−3)(x-7)(x-3)(x−7)(x−3)
x2−10x+21x^{2}-10 x+21x2−10x+21
x2−8x+21x^{2}-8 x+21x2−8x+21
x2+7 x^{2}+7x2+7
2x+82 x+8 2x+8
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