a+b=28
b+c=16
a+c=20
a+b+b+c+c+a = 20+16+20
2a+2b+2c=64=>a+b+c=64:2=>a+b+c=32
a+b+c =32
28+c=32
c=32-28=>c=4
a+16 =32
a=32-16=>a=16
20+b=32=>32-20=b=>12
SPER CĂ TE-AM AJUTAT !
