Simplify

Matching exercise

    
Match the items on the right to the items on the left.
[x (x + 1)/(x - 2)] + [x(1 - x)/(x - 2)]
(x + 2)/(x + 3) + (x - 1)/(x - 2)
 [x3/(x - y)] + [y3/(y - x)]  
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