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(2x-3y)+(2y-3x)-(x-y)
2x-3y+2y-3x-x+y= -2x
2) c
(4x-2xy-1)-(-5x+xy+1)
4x-2xy-1+5x-xy-1
9x-3xy
3) c
(2x + y)+(x-2y)
2x+y+x-2y
3x-y