factorisation of algebraic expressions
![x { }^{2} - y { }^{2} - x - y x { }^{2} - y { }^{2} - x - y](https://tex.z-dn.net/?f=x+%7B+%7D%5E%7B2%7D++-+y+%7B+%7D%5E%7B2%7D+-+x+-+y)
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