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2px² +2qxy +3pxy +3qy = rx² +23xy +12²
r = 2p
2q +3p = 23
3q = 12
3q = 12
q = 4
2q +3p = 23
2 (4) +3p = 23
8 +3p = 23
3p = 15
p = 5
r = 2p
r = 2 (5)
r = 10
Jadi, nilai r adalah 10.