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ruas kiri = 2p x² (2p+3q)xy+3q y² <----> rx²+23xy+12y²
maka 2p=r
2p+3q=23
3q=12 maka q= 4
2p+3q=23 dengan q=6 maka p=11/2
2p=r maka r = 2 . 11/2 = 11