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Agrupa els termes semblants:

 

text 3 end text times text a end text minus 1 times text 1 end text plus text 4 end text times text s end text plus text 1 end text times text s end text minus 1 times text s end text minus 3 times text s end text plus text 2 end text times text s end text minus 3 times text a end text plus text 5 end text times text a end text

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