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se stie ca a+b=7 si 2a+2b-c=10. determinati numarul c.


Răspuns :

2(a+b)-c=10
2*7-c=10
14-c=10
c=14-10
c=4
a+b=7
2a+2b-c=10=>2a+2b=7*2-c=10=>14-c-10=>c=4