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From the sum of x^2+3y^2-6x y ,2x^2-y^2+...

From the sum of `x^2+3y^2-6x y ,2x^2-y^2+8x y , y^2+8` and `x^2-3x y\ ` subtract `-3x^2+4y^2-x y+x-y+3.`

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