Resposta :
{a+b=160
{3a=7b
b-c=22
Resolvendo tudo :
a=7b/3->3a=7*48-->a336/3-->a=112°
(7b/3)+b=160-->7b+3b=480-->b=48°
48°-c=22-48-->c=26
{3a=7b
b-c=22
Resolvendo tudo :
a=7b/3->3a=7*48-->a336/3-->a=112°
(7b/3)+b=160-->7b+3b=480-->b=48°
48°-c=22-48-->c=26