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Agrupa els termes semblants:

 

negative 2 times text a end text minus 5 times text 1 end text plus text 3 end text times text 1 end text minus 2 times text a end text plus text 4 end text times text 1 end text plus text 3 end text times text z end text plus text 2 end text times text 1 end text

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