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x-y = 16
xy = 36
(x-y)²= x²+y²-2xy
256= x²+y²-72
328= x²+y²
(x+y)²= x²+y²+2xy
(x+y)²= 328+72
(x+y)²= 400
x+y= +/-20
x+y= 20
x-y= 16
x= 18
y=2
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