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