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= 2x+7y-5z -x+2y-3z
= x+9y-8z
= -2x^2 - 14y^2 - 15z^2 - 4xy - 7xy + 6xz + 5xz + 21yz + 10yz
= -2x^2 - 14y^2 - 15z^2 - 11xy + 11xz + 31yz