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20 x pangkat2+18xy-14y pangkat2
(5x-7y)(4x-2y)=0
x= 7/5,1/2
= 4x (5x+7y) - 2y (5x+7y)
= 20x² + 28xy - 10xy + 14y²
= 20x² + 18xy +14 y²
Maaf klau salah