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didapat persamaan
2px^2+2qxy+3pxy+3qy^2=rx^2+23xy+12y^2
3qy^2=12y^2
3q=12
q=4
(2qxy+3pxy)=23xy
2q+3p=23
2(4)+3p=23
8+3p=23
3p=15
p=5
2px^2=rx^2
2p=r
2(5)=r
r=10