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va rog ajutor!
a+2b=205
b+2c=120
4a+7b+6c=?​


Răspuns :

Răspuns:

4a+7b+6c=?

a+b=16 |×4

b+2c= 28 |×3

4a+4b=64

3b+6c=84

4a+4b+3b+6c=64+84

4a+7b+6c=148