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2px² +2qxy +3pxy +3qy² = rx² +23xy +12y²
> r = 2p
> 2q +3p = 23
> 3q = 12
> 3q = 12
q = 4
> 2q +3p = 23
2(4) +4p = 23
8 +3p = 23
3p = 15
p = 5
> 2p = r
2(5) = r
10 = r
Jadi, nilai r adalah 10.