(2xy-y)-(-y+xy)=    

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(2xy-y)-(-y+xy)=    

(2xy-y)-(-y+xy)=    
(2xy-y)-(-y+xy)=    

(2xy-y)-(-y+xy)=    
(2xy-y)-(-y+xy)
=2xy-y+y-xy
=2xy-xy-y+y
=xy