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y = 3 -
+ - 2xy = + - 2((2 + ) x (3 - )) = (4 + 4 + 3) + (9 - 6 + 2) - 2(6 - 2 + 3 - ) = 18 + 4 - 6 - 12 + 4 - 6 + 2 = 6 - 2 - 2 + 2