(2x-3y+z)-3{x-2[-z+(x-y)]-(3y-5z)} =(2x-3y+z)-3[x-2(-z+x-y)-3y+5z] =2x-3y+z-3(x+2z-2x+2y-3y+5z) =2x-3y+z-3
(2X-3Y+Z)-3{X-2[-Z+(X-Y)]-(3Y-5Z)}
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