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2px^2+3pxy+2qxy+3qy^2 = rx^2+23xy+12y^2
2px^2+xy(3p+2q)+3qy^2= rx^2+23xy+12y^2
3q=12
q=4
3p+2q=23
3p+2.4=23
3p=23-8
3p=15
p=5
r=2p
r=2.5
r=10