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1 ) x(x+1) - y(y-1) = (x-y) ( x+y)
x + y/2 - x-y/2 = x

2) (x + 2)² - (y-3)² = (x +y)(x-y) -1
(1-x)² + (1+y)² = x(x -2) + y(y+1)

3 ) (x + 3)² + (y-2)² = x(x-1) + y(y-1)
x(x +3) + y(y+2) = (x+y)² - 2y(x-1)


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