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a^2-2b^2-2ab-2ac canonical form

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 2      2                    
a  - 2*b  - 2*a*b - 2*a*c = 0
$$a^{2} - 2 a b - 2 a c - 2 b^{2} = 0$$
a^2 - 2*a*b - 2*a*c - 2*b^2 = 0