a, b, c
b=3a+2=>a=(b-2)/3
c=2b+3
a+b+39=c=> (b-2)/3+b+39=2b+3=> b-2+3b+117=6b+9 => 4b+115=6b+9 => 106=2b => b=53 => a=51/3=> a=17 => c=106+3 => c=109
Sper ca te-am ajutat!
