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a+b+c=35 unde b=a-5,c=b-3

Răspuns :

a+a-5+(b-3)= a+a-5+(a-5-3)
=a+a-5+(a-8)=3a-13
a+a-5+(b-3)= a+a-5+(a-5-3) =a+a-5+(a-8)=3a-13 Sper ca e bine