Răspuns :

2a+b+c=142
a+2b+c=144
a+b+2c=146
2a+a+a+b+2b+b+c+c+2c=142+144+146
4a+4b+4c=432
4(a+b+c)=432⇒a+b+c=432/4=108
a+b+c=108
Sper ca te-am ajutat!!!
[tex]2a+B+C=142 \\ a+2b+c=144 \\ a+B+2c=146\\ 4a+4b+4c=432 împărțit ecuatia cu  4\\ a+B+c=108[/tex]