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(2 + #7)^2 + (2 - #7)^2 - 4 x 2 + #7 x 2 - #7
= (2 + #7)^2 + (2 - #7)^2 - 4 x 4 - 7
= (2 + #7)^2 + (2 - #7)^2 - 4 x (-3)
= (2 + #7)^2 + (2 - #7)^2 + 12
= 4 + 7 + 4 - 7 + 12
= 28
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