-2xy+y-2xy-3y-x=(-2xy-2xy)+(y-3y)-x=-4xy-2y-x.
Ответ: -4xy-2y-x.
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-2xy+y-2xy-3y-x=(-2xy-2xy)+(y-3y)-x=-4xy-2y-x.
Ответ: -4xy-2y-x.