if x square - 4xy= -4y square,find x:y.
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x²-4xy=-4y²
x²+4y²-4xy=0
(x-2y)²=0
x-2y=0
x=2y
x:y=2:1
x²+4y²-4xy=0
(x-2y)²=0
x-2y=0
x=2y
x:y=2:1
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