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2345-1234+×=7213-2513+42

Răspuns :

x= 7213-2513+42-2345+1234 x=4742-3579 x=1163
[tex]2345-1234+x=7213-2513+42 \\ x=7213-2513+42-2345+1234 \\ x=3631[/tex]