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7+{48:(18-b)+49}÷3=26​

Răspuns :

Răspuns:

7+{48:(18-b)+49}=26×3

7+{48:(18-b)+49}=78

7+48:18-b=78-49

7+48:18-b=29

48:18-b=29-7

48:18-b=22

18-b=22×48

18-b=1056

b=1056-18

b=1038