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2px² + 2qxy + 3pxy + 3qy² = rx² + 23xy + 12y²
2px² + ( 2q + 3p )xy + 3qy² = rx² + 23xy + 12y²
3q = 12
q = 4
2q + 3p = 23
2(4) + 3p = 23
8 + 3p = 23
3p = 15
p = 5
2p = r
r = 2(5)
r = 10