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2px² + 2qxy + 3ypx + 3qy² = rx² + 23xy + 12y²
dari persamaan 3qy² = 12y²
didapat 3q = 12
q = 4
masukan ke 8xy + 3ypx = 23xy
(8 + 3p)xy = 23xy
8 + 3p = 23
3p = 15
p = 5
masukan lagi
2px² = rx²
10x² = rx²
r = 10