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2px² + 2qxy + 3pxy + 3qy²
2px² + (3p + 2q)xy + 3qy²
3q = 12
q = 4
3p + 2q = 23
3p + 2.4 = 23
3p + 8 = 23
3p = 15
p = 5
2p = r
2.5 = r
10 = r