(a+b):(a-b)=3 rest 4
a+b=3(a-b)+4
a+b= 3a -3b +4
a-b +28=a+b
a-b-a-b = -28
-b-b = -28
-2b = -28
2b=28
b=14
a+b=3a-3b+4
a+14 =3a -3*14 +4
a+14 =3a -42 +4
a+14 =3a -38
a-3a = -38 -14
-2a = -52
2a=52
a=26
Verificare:
(a+b) :(a-b)=3 rest 4
(26+14):(26-14)= 40:12= 3 rest 4
12*3=36
40-36=4
