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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}
3qy{2} = 12y{2}
3q=12
q=4
(2q+3p) xy = 23xy
2q+3p=23
2*4 + 3p = 23
8+3p=23
3p=23-8
3p=15
p=5
2px{2} = rx{2}
2*5 = r
10 = r