{ x 2 + y 2 = 1 2 0 1 3 x − 2 0 1 3 y = ( 2 0 1 4 y − 2 0 1 4 x ) ( x + y + x y + 2 0 1 5 ) Find A = [ ( x + y ) 2 − 1 ] 2 0 1 5 + 1 9 9 9
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