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2px^2 + 2qxy + 3pxy + 3qy^2= rx^2 + 23xy + 12y^2
---> 3qy^2 = 12y^2
y = 4
---> 2qxy + 3pxy = 23xy
8xy + 3pxy = 23xy
8 + 3p = 23
3p = 15
p = 5
---> 2px^2 = rx^2
r = 2 x 5
= 10