Question 65
If $$2x + 3y + 4z = 11, 8x^3 + 27y^3 + 64z^3 = 105$$ and $$xyz = 1$$, then the value $$4x^2 + 9y^2 + 16z^2 - 6xy - 12yz - 8xz$$ is:
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