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(x+y+z)(2(x^2+y^2+z^2)+10(xy+xz+yz))-81(x^2+y^2+z^2+3(xy+xz+yz))(x^2+y^2+z^2)(x^3/((7x^2+2y^2)(7x^2+2z^2))+y^3/((7y^2+2z^2)(7y^2+2x^2))+z^3/((7z^2+2x^2)(7z^2+2y^2))),x=a,y=a+u,z=a+v
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