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4cx²+(4d+3c)xy+3dy²=ex²+23xy+6y²
maka,
4c=e
4d+3c=23 dikali 3 jadi, 12d+9c=69
3d=6 dikali 4 jadi, 9d =24 _
9c = 45, maka c = 5
4c = e
4(5) = e
e = 20