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=> 2px^2 + 2qxy + 3pxy + 3qy^2 = rx^2 + 23xy + 12y^2
=> 2px^2 + (2q + 3p)xy + 3qy^2 = rx^2 + 23xy + 12y^2
3q = 12 => q = 4
2q + 3p = 23
=> 2(4) + 3p = 23
=> 3p = 15
=> p = 5
r = 2p = 2(5) = 10