Question 124193
The given expression is:


{{{(-x-y) + (x^2 + y^2)/(x-y)}}}


This can be written as: 


{{{-(x + y) + (x^2 + y^2)/(x - y)}}} 



Taking LCM, we get:



{{{(-(x + y)(x - y) + (x^2 + y^2))/(x - y)}}} 



{{{ (-x^2 + y^2 + x^2 + y^2)/(x - y)}}} 



{{{2y^2/(x - y)}}} 



Thus, the solution.