Răspuns :
a+b=316 a+5 = 2b=)a = 2b-5 2b-5 +b = 316 /+5 =) 2b+b = 316+5 =) 3b=321/:3 =) b = 107 a= 2b-5 =)a= 2*107 -5 =) a = 214-5 =) a= 209