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daca a+b=29 si b+3xc=21, atunci 3xa+5xb+6xc=? REPEDE!!! DAU COROANA!!!!!!!!!!

Răspuns :

3a+5b+6c=3a+3b+2b+6c=3(a+b)+2(b+3c)=3x29+2x21=87+42=129