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2px² +2qxy +3pxy +3qy² = rx² +23xy +12y²
r = 2p
2q +3p = 23
3p = 12
> p = 4
> 2q +3p = 23
2(4) +3p = 23
8 +3p = 23
3p = 15
p = 5
> r = 2p
r = 2(5)
r = 10
Jadi, nila r pada persamaan bentuk Aljabar adala 10.