`(2x-1)^2 + x^2 + x^2 = (2x-2)^2 +(x+2)^2 + (x - 1)^2`

`(2x-1)^2 + x^2 + x^2 = (2x-2)^2 +(x+2)^2 + (x - 1)^2`
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