Răspuns :

a= b+84

(a+b):(a-b)=4 R16

(b+84+b) : (b+84-b)=4 R16

(b×2+84) : 84=4 R16

( b×2+84) = 84×4+16

( b×2+84) =336+16

( b×2+84)= 352

b×2. =352-84

b×2=268

b= 268:2

b= 134

a = b+84

a = 134+84

a =. 218