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Daca 4a=2b=8c=x(a+b+c) aflati x.

Răspuns :

4a=8c ⇒ a=2c;
2b=8c ⇒ b=4c;
8c=x(a+b+c)  ⇒ 8c=x(2c+4c+c)=x·7c ⇒ x=8c/7c=8/7